What are the two major factors to calculate taper lengths for cones?

The correct choice focuses on speed and width as the two major factors for calculating taper lengths for cones in work zones.

In traffic control, a taper is used to gradually reduce the number of lanes available, guiding vehicles safely from one lane to another. The speed of traffic significantly influences how long this taper needs to be; higher speeds require longer tapers to provide drivers with enough distance to react and adjust their speed smoothly. The width of the lane also plays a crucial role, as wider lanes necessitate longer tapers to ensure that vehicles can safely transition without encountering sudden changes.

By considering both speed and width, practitioners can create effective traffic control setups that promote safety and minimize disruptions. This understanding is essential for effective temporary traffic control design.