Using curve speed and lateral drift speed

Vissim provides functions such as Curve speed and Drift speed for the simulation of critical traffic situations.

The values of the functions are displayed depending on the network settings for units (Selecting network settings for units).

For the Curve speed, define the curvature radius and the respective valid speed of the vehicle. These values are used in the following calculations:

• Automatic speed limit in curves, if this option is selected (Selecting network settings for vehicle behavior)
• Lateral drift speed and lateral deviation of the vehicle due to excessive speed (Defining curve speed).

Vissim uses the Lateral drift speed function to calculate the lateral offset Lateral deviation (excessive speed) for vehicles that change their lateral position due to excessive speed (Using lateral drift speed).