WEAVING ANALYSIS
> OVERVIEW
A weaving analysis was performed due to the close proximity of the Gilman Springs Interchange to the east of Theodore Street. The team used the Highway Capacity Manual (2010) and the Highway Capacity Software to determine the level of service on the mainline for various auxiliary lane configurations found in the Highway Design Manual.
> SCOPE
The team determined the auxiliary lane configuration that would provide a level of service of D or greater on the main line within the weaving segment to and from Theodore to Gilman Springs Interchange. The levels of service for each configuration are listed in the tables below.
> MERGING/DIVERGING INFLUENCE AREAS
Westbound – Gilman Springs Dr. to Theodore Street Configuration for the DDI, HDI, SPUI, and CFI.
Westbound – Gilman Springs Drive to Theodore Street Configuration for the Partial Leafclover.
Eastbound – Theodore Street to Gilman Springs Drive Configuration for ParClo, DDI, HDI, SPUI, and CFI.
> LANE DROP
When there are more lanes after the diverging section than before.
> LOS VALUES
Reference: HCM 2010 Chapter 12
Freeway Weaving Segments
LOS A
LOS B LOS C LOS D LOS E LOS F |
0-10
>10-20 >20-28 >28-35 >35 |
Only configurations with two lane exit ramps were analyzed on the Eastbound section due to the current two lane off ramp on Gilman Spring Drive.