Specify the acceleration/deceleration rates, superelevation, plan speed markers and distance settings.

Fastest Path Settings Dialog Box

Acceleration/Deceleration Rates Section

Acceleration Rate

Specify the acceleration rate value. This is the time rate of increase in velocity with respect to magnitude or direction.

Deceleration Rate

Specify the deceleration rate value. This is the time rate of decrease in velocity with respect to magnitude or direction.

Superelevation Section

Specify the superelevation values used to calculate the fastest path data. Superelevation is the angle of the road surface. Based on the AASHTO values, approach leg superelevation is usually assumed to be 2% (+0.02), and circulatory superelevation -2% (-0.02).

Plan Speed Markers Section

Select this option to set the color, line style, and spacing interval of the plan speed markers.

Distance Section

Specify the distance value. This is measured from the inscribed circle diameter to the median offset. Specify a value that is greater than the computed minimum distance to have the fastest paths start and end at a desired distance. The distance value will not change the calculation of REntry, RInt. (RIntermediate), and RExit; however, it will provide a smoother transition from the starting point to REntry and from RExit to the ending point.