What is an "acceleration lane"?

Answer: B — lane that allows vehicles to speed up before merging

An acceleration lane is designed specifically to help vehicles gain speed before merging into a main traffic flow, such as onto a highway. This lane typically appears at the entrance of highways or expressways, allowing drivers the necessary space to increase their speed to match that of vehicles already traveling at higher speeds. By providing this dedicated lane, it enhances safety by reducing the risk of collision during the merging process, as vehicles can acclimate to the faster pace of traffic without abrupt stops or slowdowns on the main road. The context helps clarify the functionality of this lane compared to other options, which serve different purposes. For instance, parking lanes are for safe vehicle stoppage, specialized lanes for slow-moving vehicles accommodate those traveling below normal speeds, and lanes designated for emergency vehicles are reserved for those responding to emergencies, ensuring they can navigate traffic quickly and effectively.