Tudor Wharf Draft Environmental Impact Report EOEA # 6744 



Level of service analysis for two-way 

 stop sign controlled intersections 

 assumes left turns from the major street 

 are affected by opposing major street 

 through traffic. Traffic on the minor 

 street is affected by all conflicting 

 traffic. The methodology is based on 

 gaps in the major street traffic in which 

 a vehicle can pass through or enter the 

 major street. Reserve capacity is 

 related to the capacity of these gaps; as 

 the gaps become smaller or less frequent, 

 the reserve capacity becomes smaller and 

 traffic backups will occur. Levels of 

 service for unsignalized intersections 

 have been defined as follows: 

 Level-of-Service Criteria For Unsignalized Intersections 



Reserve Capacity Level of Expected Delay to 



Pass. Cars Per Hour Service Minor Street Traffic 



> 400 A Little or no delay 



300-399 B Short traffic delays 



200-299 C Average traffic delays 



100-199 D Long traffic delays 



0- 99 E Very long traffic delays 



* F * 



* When demand volume exceeds the capacity of the lane, 

 extreme delays will be encountered with queuing which may 

 cause severe congestion affecting other traffic movements 

 in the intersection. This condition usually warrants 

 improvement to the intersection. 



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