WARNING Risk of injury through damaged tires
Damaged tires can cause tire pressure loss.
 Check the tires regularly 
for signs of 
damage and replace any damaged tires 
immediately.
WARNING Risk of hydroplaning due to insufficient tire tread
Insufficient tire tread will result in reduced tire grip.
In heavy rain or slush the risk of hydroplaning is increased, in particular where speed is not adapted to suit the conditions.
 Thus, you should 
regularly check the 
tread depth and the condition of the 
tread across the entire width of all tires.
Minimum tread depth for:
 For safety reasons, 
replace the tires 
before the legally-prescribed limit for 
the minimum tread depth is reached.
Carry out the following checks on all wheels regularly, at least once a month or as required, for example, prior to a long journey or driving offroad:

Six marks
 show where the bar indicators 
(arrow) are integrated into the tire tread. They 
are visible once a tire tread depth of approximately 
1/16 in (1.6 mm) has been reached.
Notes on noise or unusual handling characteristics
Notes on snow chains