and some motorcycle tires feature tread similar to off-road tires used on cars and trucks but may sometimes include an unbroken tread that runs along its center. This feature provides better traction and lower noise on asphalt at high speed and on high tire pressure, but retains the ability to provide grip on a soft or loose surface- lower tire pressure or soft ground will cause the side lugs to come into contact with the surface. Road bike tires may have shallow grooves for aesthetic purposes, but such grooves are unnecessary in narrow applications. Continuous tracks Continuous tracks such as those used on military tanks or construction machines (i.e. caterpillar tracks) have metal track segments which may be rubber-coated. They usually do not feature tread patterns, because these would offer little additional grip given the weight of the tracked vehicle. Traction is usually provided by grousers instead. See also Anti-lock braking system Forensic tire tread evidence Snow chains Traction vector Traction control system Treadwear rating References Tires