What is the length of the tangent section between a merger taper and a shift taper?

In the context of maintenance of traffic and roadway design, understanding the geometry of taper sections is vital for ensuring safe and effective traffic flow around construction zones or road diversions. The length of the tangent section between a merger taper and a shift taper is defined in the guidelines to provide a smooth transition for vehicles merging into a traffic stream or shifting lanes.

The correct option, which states that the length of the tangent section is equal to L, emphasizes the importance of having adequate space for drivers to adjust their speed and position without feeling rushed or unsafe. This standard length allows for a predictable and reliable environment where drivers can merge or shift lanes efficiently, thus minimizing the risk of accidents.

In practice, having a longer tangent section contributes to improved visibility and reaction time for both the merging vehicles and those already in the traffic stream, helping to maintain a steady flow of traffic. A tangent section that equals L ensures there is enough room for drivers to complete their maneuvers smoothly, which is crucial in maintenance of traffic scenarios.

In contrast, the other lengths presented would not provide the necessary space required for safe vehicle maneuvers, leading to potential safety concerns and an increase in the likelihood of collisions. Each of these alternative lengths, whether it be a fraction of L