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Stop

Use this dialog to specify key factors for safety calculations on roads. These factors are usually based on wet asphalt and depend on speed.

Where can I find the dialog?

In the toolbox, select the SFI Properties... icon, then the Properties tab, the Show button to the right of Road Class, and finally the Stop tab.

Using the Dialog

The following parameters are used in safety calculations:

  • Braking friction coefficient is used to calculate braking distance. The safety factor is an extra factor to reduce the risk of accidents.

  • Side friction coefficient is used when calculating the minimum curve radius at a given superelevation, so the car does not slide off the road.

  • Reaction time is the time it takes from when the driver detects a problem until braking starts. Together with the braking distance, this makes up the stopping distance.

  • Eye height is the driver's eye height in the vehicle.

  • Stopping sight object height is the height of the object you should be able to stop for.

Figure: A = Sight distance, B = Stopping distance

The program uses these parameters to calculate sight lines and stopping distance requirements in the sight control functionality.