What following time interval is recommended for a car that is pulling a trailer on icy roads?

A time interval of 8 seconds is recommended for a car pulling a trailer on icy roads because this allows for increased stopping distance and reaction time. Icy conditions require drivers to account for significantly longer braking distances due to reduced tire traction. By maintaining an 8-second gap, drivers are better positioned to respond to unexpected changes in traffic, such as sudden stops or obstacles.

This interval gives ample time to react and makes it safer given the added challenge of handling a trailer, which can affect vehicle stability and maneuverability. Adopting this precaution minimizes the risk of accidents, considering that trailers can sway and complicate stopping patterns even further on slippery surfaces. The other options, while they may suggest longer intervals, could be considered excessive for most typical driving conditions.