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Environmental
Design and
Management
Limited

Land Use Plan &
Re-development
Strategy
Appendix A


3.0


Level of Performance Analysis (Appendix A)

 

Intersection Capacity Utilization (ICU) Levels

Syncho 5.0, the LOS analysis software, also calculates Intersection Capacity Utilization (ICU) which provides additional insight as to how well an intersection is functioning and how much extra capacity is available to handle future growth, traffic fluctuation and incidents. The ICU calculation does not use existing signal timings or sign control. It simply calculates the ultimate capacity based on a fully protected, optimized signalized timing plan at a cycle length of 120 seconds. Descriptions of ICU criteria are included in Table 4.

ICU is intended to provide information for traffic planning purposes, such as traffic impact studies, future roadway design and congestion management programs. The ICU value will provide an estimation of residual capacity at signalized intersections. For un-signalized intersections, the ICU provides insight as to how well the intersection would function if it were signalized.

 
 
LOS Intersection Capacity Utilization (ICU)

LOS Description

 

A less than 10.0
The intersection has no congestion. All traffic should be served on the first cycle.(Excellent)
B between 10.0 and 20.0
The intersection has very little congestion. Almost all traffic will be served on the first cycle.(Very Good)
C between 20.0 and 35.0
The intersection has no major congestion. Most traffic should be served on the first cycle. Traffic fluctuations, accidents, and lane closures may cause some congestion.(Good)
D between 35.0 and 55.0
The intersection normally has no congestion. The majority of traffic should be served on the first cycle. Traffic fluctuations, accidents, and lane closures can cause significant congestion. (Satisfactory)
E between 55.0 and 80.0
The intersection is right on the verge of congested conditions. Many vehicles are not served on the first cycle. Minor traffic fluctuations, accidents, and lane closures can cause significant congestion. (Acceptable)
F greater than 80.0
The intersection is over capacity and likely experiences congestion periods of 15 to 60 minutes per day. Residual queries at the end of green are common. Minor traffic fluctuations, accidents, and lane closures can cause increased congestion. (Unacceptable)
G between 1.10 and 1.20 The intersection is 10% to 20% over capacity and likely experiences long congestion periods of 60 to 120 minutes per day. Long queries are common. Motorists may be choosing alternate routes, if they exist, or making fewer trips during peak hour. (Unacceptable)
H greater than 1.20 The intersection is 20% over capacity and could experience congestion periods of over 120 minutes per day. Long queries are common. Motorists may be choosing alternate routes, if they exist, or making fewer trips during peak hour. (Unacceptable)

 

 
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