Question and Options

Question: Which statement about vehicle tires is incorrect?

Options:

  1. Tread depth must not be below the legal limit.
  2. Front tires can be of different brands.
  3. Air pressure must be equal.
  4. They must be selected according to the season.

Correct Answer

Incorrect statement: 2) Front tires can be of different brands

This statement is incorrect from a test logic perspective. For safe driving, tires on the same axle should ideally have the same brand, same size, same construction, and same tread pattern. Using different brands/specifications, especially on the front tires, can negatively affect steering control, braking balance, and road grip.

Detailed Legal Regulation Analysis

Vehicle tires are not just a comfort feature; they are fundamental equipment directly related to traffic safety. Therefore, the condition of tires is evaluated within the scope of Highway Traffic legislation.

1) Tread depth must not be below the legal limit

This statement is correct. Tire tread depth is critical for road grip and, especially, for water displacement on wet surfaces. Insufficient tread depth:

  • increases braking distance,
  • increases the risk of aquaplaning,
  • weakens the vehicle's road grip.

In Turkey, the technical compliance and safe operation of vehicles are inspected under the Highway Traffic Regulation and related technical legislation. Driving with tires that have insufficient tread depth is hazardous to traffic safety.

2) Front tires can be of different brands

This statement is incorrect.

Although having different tire brands is not always explicitly prohibited, in practice and for test purposes, it is expected that tires on the same axle have matching specifications for safety. Using different brands on the front tires creates the following risks:

  • different road grip between the right and left wheels,
  • imbalance during braking,
  • unpredictable vehicle behavior in corners,
  • differences in steering response.

Since the front axle directly affects steering and braking, using mismatched tires here is contrary to safe driving principles.

3) Air pressure must be equal

This statement is generally correct. Tire air pressure should comply with the values recommended by the manufacturer. A pressure difference between tires on the same axle can cause:

  • the vehicle to pull to the right/left,
  • uneven wear,
  • increased fuel consumption,
  • deterioration of braking performance.

Checking tire pressure is among the driver's regular maintenance responsibilities. This issue is consistent with the Highway Traffic Regulation and vehicle maintenance principles for safe operation.

4) They must be selected according to the season

This statement is correct. Selecting tires appropriate for seasonal conditions is one of the fundamental requirements for safe driving.

  • Using appropriate tires in winter conditions improves traction and braking performance.
  • Summer tires work more efficiently in hot weather.
  • Tires not suitable for the season reduce road grip and braking safety.

In Turkey, the use of winter tires, in particular, is important during specific periods and for certain vehicle groups under the Highway Traffic Regulation and related administrative rules.

Evaluation from a Legal and Safety Perspective

The fundamental knowledge tested in this question is the driver's technical and legal awareness regarding tire safety. The correct approach to tires is as follows:

  • Tires must have sufficient tread depth,
  • Their pressure must be in line with the manufacturer's recommendation,
  • They must be selected according to seasonal conditions,
  • They should have as compatible features as possible on the same axle.

These principles are directly linked to the Highway Traffic Regulation, regulations concerning the technical specifications of vehicles, and traffic safety principles.

Important Reminders

  • A tire check is a basic safety inspection that should be done before setting off.
  • Not only the tread depth but also the tire's age, sidewall condition, and pressure are important.
  • Mismatched tires on the same axle seriously reduce driving safety.
  • Using season-appropriate tires is even more critical, especially for commercial vehicles.

Conclusion

In this question, the incorrect statement is “Front tires can be of different brands.” This is because, for safe driving, tire compatibility is essential for road grip and braking balance, requiring them to have similar characteristics on the same axle. Drivers should perform regular tire maintenance to both comply with regulations and ensure traffic safety.