How to model Grade-separated entry/exits which are not adjacent - TRL Software
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TRL Software > Support & Training > Articles > How to model Grade-separated entry/exits which are not adjacent

How to model Grade-separated entry/exits which are not adjacent

If the arm is “in effect” an entry-only arm. You should measure the separation between the centres of the entry and the previous ENTRY (on a previous arm). If the separation is greater than 160 metres, 160 should be entered.

ALL arms of ‘large’ or grade-separated junctions should have a separation distance entered.

When you specify that “Grade Separated Entries passing over/under roundabout” the analysis program uses different capacity relationships from those used normally. They should also be used for large roundabouts (>130 metres). The relationships used are those defined in “The capacity of entries to very large roundabouts” (Marie Semmens, 1988).

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