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Left Turn Phase calcs from MODOT EPG

Left Turn Phase calcs from MODOT EPG

Left Turn Phase calcs from MODOT EPG

(OP)
I'm trying to understand the calculations for capacity criteria for Permissive-Only and Protective/Permissive Left turns that are given in the Missouri Dept of Transportation EPG. In section [902.5.23 Signal Indications for Left-Turn Movements – General (MUTCD Section 4D.17)] where the Permissive Only and Protective/Permissive left turn calcs are under "Capacity Criteria" it shows VLT+VO<600x(gp/cp) and (VLT)pp+VO,1200x(gpp/cpp). Where do the numbers 600 and 1200 come from? What are these numbers representing?

I work in a smaller city and am wondering if I can scale these calculations to better fit the capacities I'm studying. So knowing what these numbers are for will help me determine if I can scale.

Thanks!

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