Arrival Turning Flows
Average Daily Traffic
Exit Width Ex and Exit Lanes nex
Exit Road Width Vx and Lanes nvx
Exit geometry has four four geometric parameters.
These parameters are not used directly in the HCM or geometric capacity models. However it is crucial that they are consistent with other capacity and accident parameters.
If there are inconsistencies, they can seriously affect the performance of other parameters crucial to capacity and safety. For example an entry with two through lanes feeding into a single lane exit will have both capacity and accident issues. However, when they are consistent the exit geometry then has no effect.
The exit parameters are therefore used for error checking and warning messages in both the HCM and geometric models.
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