Question image

Question 4694

What should you do so that the vehicle has better grip on the roadway?

  1. Use radial tires on the front wheels and bias-ply tires on the rear wheels.
  2. Inflate the tires above the pressure recommended by the manufacturer.
  3. Make sure the tire tread depth is never less than 1.6 mm.
Show answer and explanation

Correct answer: Make sure the tire tread depth is never less than 1.6 mm.

The tread channels water out from under the tire so the rubber stays in contact with the asphalt. Below 1.6 mm, the legal minimum for a passenger car, it no longer clears water well, and the car has less grip, especially in wet conditions. Mixing radial and bias-ply tires is not allowed, except for the spare tire, and pressure above the recommended level puts less rubber in contact with the ground. In the image, the passenger car is traveling along a wet street.

Real Decreto 2822/1998, de 23 de diciembre, por el que se aprueba el Reglamento General de Vehículos