While driving a double trailer, what should the driver primarily focus on in terms of distance management?

When driving a double trailer, the primary focus on distance management should be on keeping a safe following distance. This is essential because of the increased length and weight of double trailers, which require more time and distance to stop effectively compared to a standard vehicle. Maintaining a safe following distance allows for adequate reaction time in case of sudden stops or emergencies by other vehicles on the road.

Additionally, it helps to prevent the risk of collision due to diminished visibility caused by the double trailer's length. By maintaining this safe distance, the driver can ensure that they are not too close to the vehicle in front, which allows for safe navigation through different driving conditions and contributes to overall road safety.

The other options focus on actions that are not conducive to safe driving practices with a double trailer. Speeding up to overtake other vehicles can lead to risky situations, while maintaining a steady speed regardless of distance may ignore the need for adjustments based on the conditions of the vehicles ahead. Frequent lane changes can create instability and complicate the management of the trailer's length and turning radius, making it more challenging to maintain a safe following distance.