kiihdytyskaistalta

Kiihdytyskaista, also known as an acceleration lane or merge lane, is a short road section used to allow vehicles to increase their speed to match the flow of traffic on a main road or highway before merging. These lanes are typically found at the entrances to highways, freeways, or high-speed roads, and their purpose is to facilitate a safe and efficient transition for merging vehicles.

The design of a kiihdytyskaista is crucial for its effectiveness. It generally begins at the point of entry from an access road and extends for a certain distance, gradually widening or lengthening to provide sufficient space for acceleration. The length and design can vary depending on factors such as the speed limit of the main road, traffic volume, and the angle of the merge.

The primary function of a kiihdytyskaista is to reduce the speed differential between merging vehicles and those already on the main road. By allowing drivers to accelerate within the dedicated lane, they can reach a speed closer to the prevailing traffic flow, minimizing disruption and the risk of collisions. Drivers on the main road are often expected to adjust their speed or lane to accommodate merging traffic, though the responsibility for a safe merge primarily lies with the driver entering the main road.

The presence and proper use of kiihdytyskaistat are considered important safety features in road engineering, contributing to smoother traffic flow and a reduction in accident rates at points where traffic streams converge.