Tire tread
WARNING
Although the applicable federal motor vehicle
safety laws consider a tire to be worn when
the tread wear indicators (TWI) become
visible at approximately 1/16 in (1.6 mm), we
recommend that you do not allow your tires
to wear down to that level. As tread depth
approaches 1/8 in (3 mm), the adhesion
properties on a wet road are sharply reduced.
Depending upon the weather and/or road
surface (conditions), the tire traction varies
widely.
Do not use tires that are excessively worn as the tire traction on wet road surfaces decreases significantly when the tread depth is less than 1/8 inch (3 mm).
Tread wear indicators (TWI) are required by law. Six indicators are positioned on the tire tread. They become visible as soon as a tread depth of approximately 1/16 inch (1.6 mm) has been reached. If this is the case, the tire is so worn that it must be replaced.
The recommended tread depth for summer tires is at least 1/8 inch (3 mm). The recommended tread depth for winter tires is at least 1/6 inch (4 mm).

Bar marking 1 for tread wear is integrated into the tire tread.
See also:
Going & Stopping
A 268-horsepower, 3.5-liter V-6 is standard. The engine moves the GLK350
rapidly when you want, and the seven-speed automatic transmission consistently
shifts smoothly no matter if you're driving ...
Call priority
When service calls are active, e.g. Roadside Assistance or MB Info calls, an
emergency call can still be initiated. In this case, an emergency call will take
priority and override all other active ...
DOT (Department of Transportation)
DOT marked tires fulfill the requirements of
the United States Department of
Transportation. ...
