Geometry > Entry Geometry

Entry Geometry

The widths and radii of the entry lanes is an important factor in determining the queues and delays at the roundabout.

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Entry Geometry
The entry geometry has five parameters displayed in the data table below.
Entry Width E
The HCM model uses the number of entry lanes only and does not use the Entry Width.
Number of Entry Lanes ne
The HCM capacity model includes ne.
Flare Length L’
Flare length is the distance from the entry to the halfway point in the approach.
Entry Radius R
HCM does not use the entry radius R.
Entry Angle Phi (Ф)
The HCM model does not use the entry angle Phi.

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