stop start AUDI S6 2009 Owners Manual

Table of contents
Table of contents
Vehicle literature ........ .
About this Owner's Manual .............. ...... . .
Controls and
equipment ............ ..... .
Instruments and controls ..... .
General il lustration ............. .
Instruments and
warning/indicator lights ....... .
Instruments .............. ..... .
Warning/indicator lights ........ .
Driver information display ..... .
Introduction ................... .
On-Board Diagnostic system (OBD)
Auto Check Control ............ .
Speed warning system ..... .. .. .
Trip computer ..... ... .. .. ... .. .
Opening and closing .......... .
Keys ... ..... .......... ... ..... .
Power locking system ..... ... .. .
Rear lid ....................... .
Child safety lock .... ......... .. . 5
6
9
11
1
1
12
12
16
23
23
27
28
36
38
41
41
45
50
51
Convenience key . . . . . . . . . . . . . . . . 52 Anti-theft
alarm system ........ .
Power windows ... ... .... .... .
S liding/ti lting power sunroof . .. .
Clear vision . .... .. .. .......... .
Lights ... ................ ... .. .
In ter ior l ights ...... ... .. .. .. .. .
Vision ... ... ......... ...... ... .
Wiper and washer system ...... .
Mirrors .................... ... .
Digital compass ............... .
Seats and storage ..... .... ... .
General recommendations ..... .
Power seat . ... ... ......... ... .
Seat m emory ...• ........ .... ..
Rear seats .......... ....... ... .
Head restraints ........ ..... .. .
Arm rest ....... ... ... ... ... •..
Luggage compartment ..... ... .
Roof rack ..... .......... ... .• ..
Cupholder .. ...... ... .. ... ..• ..
Ashtray ................... ... .
Cigarette lighter /socket ........ .
Storage ............ ....... ... .
Warm and cold ............... .
Climate control ........ .. ... .. .
Basic settings ......... •. ... ....
On the road . ... ..... .. ..... ... .
Steering .................... .. .
Ignition lock and ignition switch .
Starting and stopping the engine
Starting and stopping the engine
with Convenience key ....... .. .
Electromechanical parking brake .
Cruise control ......... ........ .
54
55
58
63
63
68
69
71
75
78
80
80
81
84
85
86
88
88
93
95
96
97
99
102
102
1 1 1
114
114
116
117
118
121 124
Adaptive Cruise Control ....... .
Speed and distance control system
Driver informa tion ....... ...... .
System limitations ............. .
Audi lane assist ............... .
Lane assist ......... ........ .. .
Audi side assist ............... .
Lane Change Assistant .. ..... .. .
Notes ....................... •.
Automatic transmission ....... .
tiptronic® (6-speed automatic
transmission) ... .... ... ... .... .
multitronic® ..........•........
Audi Parking System ......... . .
Park Assist Systems .... ... .... .
Audi Park ing System (rear) ...... .
Audi Parking System (rear, with rear-
view camera) .... .. ...... ..... .
Specia l parking situations ..... •.
Settings in the MMI ....... ..... .
Saf ety tips . ............ .... ... .
Adaptive Air Suspension ...... .
Adaptive Air Suspension and
Damping ............. ........ .
Homelink® . ................ ... .
Universal remote control ....... . 127
127
135
140
143
143
146
146
153
155
155
161
169
169
169
171
178
180
181
184
184
188
188

Instruments and controls
General illustration
G)
0
©
©
©
©
0
©
Power window switches ...... .... ..... .. ....... .
Door handle
Memory buttons (driver's seat)
Power locking switch .......................... .
Adjuster control for outside mirrors .. .... .... .... .
Air outlets ........ ... ...... .... ...... .... ... .. .
Light switch .... .... ........... .... .... .... ... .
Control lever for :
- Turn signal and high beam
- Lane assist .... .... ... .... .... .... .......... .
Control lever for:
- Cruise control
- Adaptive Cruise Contro l .......... ...... .... .. .
@ Multifunction steering wheel with:
- Horn
55
84
49
76
108
63
67
143
124
127
- Driver's airbag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219
- Shift buttons ................................ 160, 167
@
@
@
@
-Button for steering wheel heating
Instrument cluster ... .... ... .... ...... ......... .
Switches for
- Windshield wiper/washer ..... ...... ..... .. ... .
- Trip computer ..... .. ..... ... .... ...... ... .. .
Steering lock/ignition/starter switch
Buttons for
- Reset button for trip odometer ... .. .... .... ... .
!CHECK] .. .... ....... .... .... ....... .... ... .
Instrument lighting .... ... .... .... ... ..... ... .
Controls and equip ­
ment
1 1 1
12
71
38
116
14
15
16
Instruments and controls
@ MMI Display, see separate manual
@ Depending on equipment, switches for:
- Electronic Stabilization Program (ESP)
- Side assist .. ... ..... .. .. .. .... .... .... ... ... .
- Emergency flashers .......................... .
- Power sunshade .... .... .... .... ... .... ..... . .
- Valet key function .... ....... ...... .... ...... .
@ Buttons for
- Switching MMI display on/off
- Unlocking glove compartment
@ Glove compartment ........... .... .... ......... .
@ Front passenger's airbag .. .... .... ... .. ...... .. .
@) Climate controls ......... .. .. .... .... .... .. . .. . .
@ Ashtray ..... .... .... ....... .... .... .... ... ... .
@ Shift lever for automatic transmission
- 6-speed automatic transmission .. .. .... .... ... .
I . .
® -
mu t1tron1c ... .... .... .... .... .... ... ...... .
@ MMI Terminal, see separate manual
@ Storage with cupholder . ........ ... .. .... .... ... .
@ Electromechanical parking brake ... .... .... .... .. .
@ ISTART ]-~STOP ] button .. ... ..... ... .... .... ... .
@ Adjustable steering wheel, depending on equipment:
- mechanica l .. .. .... .... ..... .. .... ..... ... .. .
- electrica l ... ...... .... ... .. .... .... ...... ... .
@) Data Link Connector for On Board Diagnostics (OBD II)
@ Hood release . .... .... ...... ... .. .... .... ... ... .
@) Switch for
unlocking the fuel filler door ..... ...... .... ... .
- unlocking the trunk lid . .... .... .... .... ... ... .
I • •
262
146 67
70
44
99
99
219
104
96
155
163
95
121
118
114
114
27
300
297
50 •

Warning light in the instrument cluster -L
When the _L warning light in the instrument cluster starts to flash,
this can mean one of two things: either the coolant
temperature is
too high, or the coolant
level is too low=> page 31.
If the needle is well in the upper area of the gauge, the coolant
temperature is too high. Stop the vehicle, switch the engine off and
allow the engine to cool. If the warning light comes on again after
driving a short distance, contact an authorized dealer.
& WARNING
• Always observe the warning in => page 293, "Engine compart­
ment", before opening the hood and checking the engine coolant
level.
• Never open the engine hood if you see or hear steam, or if you
see engine coolant dripping from the engine compartment . You
could burn yourself. Let the engine cool off first so that you cannot
hear or see any steam or engine coolant.
0 Note
• Mount ing additional lights or accessories in front of the air inlets
reduces the cooling effect of the radiator. At high outside tempera­
tures or high engine load, the engine could overheat .
• The front spoiler has been designed to properly distribute the
cooling air when the vehicle is moving. If the spoiler is damaged,
this could reduce the cooling effect and the engine could then over ­
heat. Ask your authorized Audi dealer for assistance. •
Tachometer (engine rev counter)
The tachometer indicates the engine RPM (revolutions per
minutes).
Th e tachometer 0 => page 12, fig. 2 is the left of the two large clock ­
type displays.
Controls and equip ­
ment
Instruments and warning/indicator lights
The engine turns at a speed 1,000 times the single digit in the
display, e.g. if the needle is pointing at the "2" the engine is turning
at
2,000 RPM.
If engine RPM drops below
1,500, you should downshift to the next
lower gear. The red area at the end of the scale indicates maximum
permissible engine RPM after the break -in period. Before reaching
this area, move the selector lever to position "D (Drivel" or ease your
foot off the accelerator pedal.
0 Note
The tachometer needle should not move into the red range. If it
does, then only for a very short period of time. You could damage
your engine by driving at high RPM.
'£> For the sake of the environment
Upshifting early saves fuel and reduces engine noise .•
Digital clock with date display
Dote and time of day con be set in the MM/.
Fig . 3 Instrument
cluster with digital
clock
The date, time of day, and time and date format can be set in the
MMI. You can find out more in the MMI manual. .,_
I • •

Instruments and warning/indicator lights
turned off, the warning/indicator light illuminates for about 30
s e co nds.
The warnin g/indicator li ght wi ll go out when the par kin g brak e is
r e lea sed .
I f the wa rn in g/ind ica tor l ig ht flas hes co ntinu ously
after applying th e
par king brake, brakin g force is not sufficient to prevent the veh ic le
fr om r olling u nint enti onally. Ple as e n ote the foll owin g:
• If the s lope of the ground is too steep to park the vehicle, the
additio nal drive message appea rs
Caution: Vehicle parked too
steep .
• In the even t of a parking brake malf unc tion, the yel low I sym bol
appears in the instrument c luster display and the driver m essage
Parking brake malfunction! is displayed. Have the ma lfunct ion
repa ired as soo n as possible b y a qua lified Aud i deale rship. •
Brake system BRAKE (USA models) /(©) (Canada
models)
Th e warn ing/indicator light f lashes if brake fluid level i s
low, if there is an ABS sy stem malfunct ion or a par kin g
b ra ke malfun cti on.
The light illuminate s when the ignition i s turned on . It goes out afte r
the engine has been start ed. Thi s ind icates t hat th e bra ke w arni ng
light is functioning properly .
If the brake warning light does not light up when the engine is
cranking , there may be a malfun ction in the electrical system . In this
case , contact your Audi dealer .
If the b rake system warni ng/ind icator l ight flas he s, t here is a b rake
system malfunction . By pressing the [
CH ECK ] button, you can bring
up a dr ive r m essage w hic h exp la in s the mal funct io n i n mor e deta il
=>
page 30 .
If the ABS fai ls, the A BS warning/indicator lig ht _. (USA
mod els)/ (Ca nada mode ls) flas hes toget he r w ith th e brake sys te m
warn ing/ indicator lig ht=>
& -
(U SA mode ls): If the warni ng light BRAKE and the warning light
illumin ate t oget her, im medi ate ly contact yo ur a uth orized Aud i
dea ler or qua lified workshop to have all brake pads ins pected
=>
p age 35.
When the l ig ht comes on, an aud ible warning signal is also giv en .
& WARNING
• USA models : If the BRAKE warning light and the Af'l~ warning
light come on together , the rear wheels could lock up first under
hard braking . Rear wheel lock-up can cause loss of vehicle control
and an accident . Have your vehicle repaired immediately by your
authorized Audi dealer or a qualified workshop . Drive slowly and
avoid sudden, hard brake applications.
• Canada model s: If the brake warning light (Q)) and the ABS
warning light come on together , the rear wheels could lock up
first under hard braking . Rear wheel lock -up can cause loss of
vehicle control and an accident . Have your vehicle repaired imme­
diately by your authorized Audi dealer or a qualified workshop .
Drive slowly and avoid sudden , hard brake applications.
• If the brake warning /indicator light does not go out after a few
seconds and the parking brake released, or lights up while you are
driving , the fluid level in the brake fluid reservoir is too low . If you
believe that it is safe to do so , proceed immediately at low speed
to the nearest authorized Audi dealer or qualified repair facility and have the brake system inspected .
• Always keep
in mind that after several brake applications , you
will need greater pressure on the brake pedal to stop your vehicle. Do not rely on strained brakes to respond with maximum stopping
power in critical situations . You must allow for increased braking
distances . The extra di stance used up by fading brakes could lead
to an a ccident. •

On-Board Diagnostic system (08D)
Malfunction Indicator Lamp (MIL)
The Malfunction Indicator Lamp (MIU ~ in the instrument cluster
~ page 16, fig. 7 is part of the On-Board Diagnostic (OBD ID system.
The warning/indicator light illuminates when the ignition is
switched on and goes out after the engine starts and the idle has
stabi lized . This indicates that the MIL is working properly.
If the light does not go out after the engine is started, or illuminates
while you are driving, a malfunction may exist in the engine system.
If the light starts flashing, the catalytic converter could be damaged.
Continue driving
with reduced power (avoiding sustained high
speeds and/or rapid accelerations) and have the condition
corrected. Contact your authorized Audi dealer.
If the light illuminates, the electronic speed limiter may also be
malfunctioning . For more information~
page 27, "Electronic speed
limiter".
An improperly closed fuel filler cap may also cause the MIL light to
illuminate
~ page 297. •
On-Board Diagnostics
Con tro ls and eq uip­
ment
Fig . 16 Location of
Data Link Connector
(D LC )
Driver information display
On-Board Diagnostics monitors the components of your emission
control system. Each monitored component in your engine sys tem
has been assigned a code. In case of a malfunction, the component
wil l be identified and the fault stored as a code in the control
module memory .
The M IL light may also illuminate if there is a leak in the on -board
fuel vapor recovery system. If the light illuminates after a refuelling,
stop the vehicle and make sure the fuel filler cap is properly closed
~ page 297.
In order to make an accurate diagnosis, the stored data can only be
d isplayed using special diagnostic equipment (generic scan tool for
OBDl.
In order to connect the special diagnostic equipment, push the plug
into the Data Link Connector (DLC). The DLC is located to the right of
the hood release~ fig. 16.
Your authorized Audi dealer or a qua lified service station can inter­
pret the code and perform the necessary repair. •
Electronic speed limiter
Your vehicle may be factory equipped with tires that are rated for a
maximum speed of 130 mph (210 km/h). This is less than the
maximum speed of your vehicle. To reduce the risk of sudden tire
failure and loss of control if the vehicle is operated at excessive
speeds, your vehicle also has an electronic speed limiter. The elec­
tronic speed limiter prevents your vehicle from going faster than the
tire speed rating. For more information~
page 329.
If the engine control unit receives faulty vehicle roadspeed signa ls,
the Malfunction Indicator Lamp (MIU will i lluminate . If this
occurs, contact the nearest authorized Audi dealer for assistance. .,.
Vehicle care I I Technical data

Driver information display
Engine oil pressure malfunction "t=;f':
The red engine oil pressure warning symbol requires
immediate service or repair. Driving with a low-oil-pres­
sure indication is likely to inflict severe damage to the
engine.
If the ~ symbol appears in the display and blinks, the oil
pressure is too low. An additional driver message can also
be displayed by pressing the
!CHECK] button:
Switch off engine and check oil level
Immediate actions
- Pull off the road.
- Stop the vehicle.
- Turn off the engine.
-Check the engine oil level with the dipstick=:> page 305.
Dipstick readings checks too low
-Top off oil to the proper level ::::, page 306.
Make sure that the oil pressure warning symbol~
appears no longer in the display before you start driving
again.
Dipstick reading checks OK
- If the oil pressure warning symbol~ starts flashing
again even though the engine oil level checks OK on the
dipstick,
do not continue driving and do not let the
engine run in idle.
Instead, contact your authorized Audi
dealer for assistance.
[ i] Tips
• The engine oil pressure symbol ~ is not an indicator for a low
engine oil level. Do not rely on it. Instead, check the oil level in your
engine at regular intervals, preferably each time you refuel, and
always before going on a long trip.
• The yellow oil level warning indication ,.. requires oil refill or
workshop service without delay. Do not wait until the red oil pres­
sure warning
~ starts to flash before you respond to the low oil
level warning ...... By then, your engine may already have suffered
serious damage. •
Steering malfunction i
If there is a malfunction in the electronic steering column
lock, the steering cannot be unlocked.
If the i symbol in the display blinks, there is a malfunction
in the electronic steering column lock. An additional driver
message can also be displayed by pressing the
I CHECK]
button:
Do not drive vehicle: Steering defective
-Contact your nearest authorized repair facility.
- Do
not tow your vehicle.
& WARNING
Your vehicle must not be towed in the event of a malfunction in the
electronic steering column lock because it cannot be steered due
to the locked steering. If it is towed with the steering locked, there
is the risk of an accident. •

Ignition lock malfunction ~
A malfunction in the ignition Jock must be repaired imme­diately.
If the ~ symbol in the display blinks, there is a malfunction
in the electronic ignition lock. An additional driver message
can also be displayed by press ing the [CHECK] button:
Ign iti on lock defe ctive . C ont ac t wo rkshop !
- Do not turn the engine off.
- Drive immediately to an auth orized A udi dealer to have
the malfunction corrected .
If there is a malfunction in the electronic ignition lock, the ignition
cannot be turned off . Drive immediately to an authorized Audi
dea ler to have the cause of the malfunction corrected .
On vehicles with Convenience key*, the engine should not be
switched off using the [
STOP] button because the engine cannot be
started again after the ignition is switched off. •
Yellow symbols
A yellow symbol means WARNING.
Contro ls and eq uip­
ment
Fig . 19 Dis pl ay: low
fu el le ve l wa rning
(pr io rity 2)
Dri ver inf orm atio n di spl ay
Ye llow symbols indicate a priority 2 malfunction -Warning!
When a yellow warning symbol appears,
one warning tone sounds.
A driver message appears as well to explain the malfunction in more detail. The driver warning goes out after about 5 seconds, but it can
be brought up again at any time by pressing the [ CHECK
I button .
Check the displayed function as soon as possible . If
more than one
priority 2 malfunction is detected , a ll symbols will appear one after
the other for about 2 seconds.
Yellow symbols mean:
Convenience key*
~ page 120
Key not in vehicle
USA models: ~ page25
Defective brake light
Canad a mod els: ~ page25
Defective brake light
11 Defective light bulb
~ page25
-
Light/rain sensor defective ~ page34
Windshield washer fluid ~ page34
level low
Low fuel leve l
~ page34
Battery voltage ~ page35
Worn brake pads ~ page35
IIDynamic headlight range ~ page35
control defective
-
Check engine oi l level ~ page35
~ page305 ...
Vehicle care I I irechnical data

Driver inf ormati on displ ay
Engine oil sensor malfunction => page 35
._ -
Engine speed limitation* => page 36
--Adaptive Light* defective :::::, page 36
Ignition lock malfunction :::::, page 36
--Windshield wiper defective :::::, page 36
Tire pressure monitoring sys -:::::, page 337
tern
Loss of tire pressure
Tire pressure monitoring sys -:::::, page 337
tern
System not available
Ba ttery in remote control key
--Electromechanical
parking brake
Automatic transmission ma l­
function
A pplies to vehi cles : wi th Conven ien ce key
Key not in vehicle
K ey not in vehicle
=> page 43
=> page 123
:::::, page 160,
=> page 167
-
-
-
-
This reminder appears along with the.., symbol if the master key is
removed from the vehicle with the engine running. It is intended to
remind you (e.g . when changing drivers) no t to continue the journey
without the master key.
If the master key is no longer in the vehicle, you cannot switch off
the ignition after stopping the engine and you also cannot start the
•
engine again . What is more, you cannot lock the vehicle from the
outside. •
Light/rain sensor defective
Au tomat ic he adl ight s/au tomatic wiper s defec tive
If the symbo l illuminates, the light sensor has failed . For safety
reasons the low beams are turned on permanently with the switch
in
AU TO . However, you can continue to turn the lights on and off
using the light switch. In the case of a defect in the rain sensor, the
windshie ld wiper lever functions are still available. Have the
light/rain sensor checked as soon as possible at a dea lership .•
Windshield washer fluid level too low "')
U Please top up washer fluid
If the symbol il luminates, add windshield washer fluid to the washer
system and also to the headlight washer system:::::,
page 316. •
Fuel supply too low Q.)
L Pl ea se refuel
When this symbol il luminates for the first time, the fue l reserve
in your vehicles is still about 2 Gal lons (7 to 9 litersl. Refuel as soon
as possible :::::,
page 296.
If the symbo l lights up, even when there is ample fue l in the tank,
and the text
T an k s yste m m alf un ction ! Cont act w orks hop appears
in the display, there is a fault in the system. Contact a qualif ied work ­
shop to have the fault rectified .•

Clear vision
Lights
Switching the headlights on and off ·'t!-·
In the "AUTO " position, a light sensor automatically
s w itches t he head- and tailligh ts on and off in response to
l ight con ditio ns.
Fig . 5 1 In strument
p an el: l ight swit ch
The light switch must not be ove rt u rned pas t the stops in
either direction .
Switching on automatic headlight control
-Tu rn the light swi tch to AUTO => fig. 51 .
Switching on the side marker lights
- Turn t he light switch to ~oo~ .
Switching on the headlights and high beam
-Tur n t he light switch to gD.
- Pu sh th e hi gh bea m le v er for ward tow ards t he inst ru-
m ent panel
=> page 67 .
Con tro ls and eq uip­
ment
Switching off the lights
- Tu rn the light sw itch to 0. Clear vision
The head
ligh ts only work when the ignitio n is switched on . While
starting the engine or when switching off the ignition, the head ­
lights wil l go off and only the side marker lights wil l be on.
After starting the engine, the headlights are automatica lly
adjus ted* to the load and ang le of the vehicle (for example, du ring
acceleration, braking) . This prevents oncoming traffic from experi ­
encing unnecessary headlight glare from you r headlights .
If the system is not operating properly, a warning symbol in the
Auto -Check Contro l is displayed
=> page 35.
With the side marker lights or headlights switched on, t he sym bol
next to the light switch illuminates
coo:.
Daytime running light s
• USA models :
On vehicles with xenon lights the daytime running
ligh ts will come on automa tically when the ignition is tur ned on and
the light switch=> fig. 51 is in the
O position or the AUTO position
(on ly in daylight conditions). The
Daytim e running lights func tion
can be turned on and off in the MMI menu
Exteri or lighting
=> page 6 4. On vehicles with halogen lights there is no daytime
running ligh ts function=> &,.
• Canada models: The daytime running lights wi ll come on au to ­
matically when the ignition is turned on and the ligh t switch
=> fig. 5 1 is in the O position or the AUTO positi on (only in dayligh t
conditions)
=> &, .
Automatic headlight control
In the switch posi tion AUTO the automatic headlight contro l is
turned on . The low beams are turned on automatica lly through a
light sensor as soon as ambient brightness (e .g. when driving into a
tunnel) fa lls below a value preset at the factory . When ambie nt ..,_
Vehicle care I I irechnical data

Clear vision
One-touch wiping
- Move the lever to position@, when you want to wipe the
windsh ield
briefly.
Automatic wiper /washer
- Pull the lever to pos ition © (toward the steering wheel)
and ho ld.
- Re lease t he lever. T he wash er stops a nd the wipers keep
g o ing for about fo ur secon ds. Dep ending on h ow long
t h e lever is held, d ifferent numbers of was h cyc les are
performed.
Turning off the wipers
- Move the lever back to position @ .
Gen era l inform ati on
The windshield wipers and the windshield washer system operate
only with the ignition on.
During a temporary stop, e.g. at a traffic signa l, the set wipe speed
is aut omatically reduced by one stage .
The windshield washer nozzles are heated at low temperatures
when the ignition is on .
Removing vv ater drop let s
About 5 seconds after the wash cycle is complete, the wiper system
performs a single automatic wipe cycle to remove any water drop ­
lets that remain on the windshield .
If you would like to deactivate this delayed wipe cyc le whi le dr iving,
you have to pull the lever to position © again within 10 seconds
af ter this w ipe cyc le .
Water droplet removal is reactivated after the ignition is switched off and then on again .
Rain se nsor
The ra in sensor operates on ly in the interval wiper position . When it
starts to rain, the interval wiper mode is activated automatically .
I f the windshie ld wiper lever is in the interval wipe position with the
ign ition sw itched off, the rain sensor is not activated unt il veh ic le
speed is above 4 mph (6 km/h) .
T o reduce the sens itivi ty of the rain sensor, the swi tch
© must be
moved down. To increase the sensitivity of the rain sensor, the
sw itc h must be moved up .
T he higher the sensitivity sett ing, the sooner the windshield wipers
react to moisture on the windshie ld. Increased sensitivity is
signa led by the windshie ld w ipers making a si ng le pass over the
windshield.
T he rain sensor wiper interva ls depend on the sens itivity setting as
we ll as vehicle speed. During brief stops, wiper motion will adjust in
r elation to the amount of rain on the windshield .
& WARNING
• Wiper blades are crucial for safe driving! Only when they are in
good cond ition are they able to clear the windo ws properly to
provide uncompromised visibility . Worn or d am aged wiper blades
are a safet y hazard ::::> page
74 , "I nst alli ng new wiper blades "!
• The rain sensor is only designed to a ssist and support the
dri ver . It remai ns entirel y the dr iver's respon sibil ity to monitor
out side weather conditions and to manually activate the wiper s as
so on a s rain or dri zzle reduce s vis ibility through the wind sh ield.
• The wind shield must not be treated with water -repellent mate ­
rials . The y can incre as e g la re under poor visibility condition s su ch
as wetness , darkne ss, or when th e sun is low on t he horizon. In
addition , they can cause the wind shield wiper s to ch att er.
0 Note
In freezing or near freezing conditions :