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The Effect of Turn Penalties on Minimum Paths in Coded Street Networks
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1968-04-01
[PDF-11.23 MB]
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Abstract:Investigation of the effect of the use of the turn penalty was undertaken. Several trees from the detailed and intermediate networks in Waco, Texas with and without a turn penalty were compared and differences within each set of trees analyzed. The conclusions were as follows: Minimum path trees without a turn penalty (zero turn penalty) did not differ significantly from those when a 0.20-minute turn penalty was used. Illogical routings resulted just as often or more often with the 0.20-minute turn penalty as with the zero-turn penalty. No significant stair-stepping occurred in any of the paths even with the well-defined grid system of the detailed network which is a block-by-block representation of the Waco street network. It is believed that this is due to the level-of-service speed concept used in defining the link speed parameter. The coding of a higher level-of-service speed for the more important, higher volume links appears to prevent stair-step paths.
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