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Table 2-2 Signal Timing Process Examples Step Signal Timing Process Steps Single Intersection Field Adjustment Regional Signal Timing Optimization 1 Project Scoping Typical maintenance is performed on a routine basis A detailed scope of work is developed and the effort is completed every one to five years 2 Data Collection Phone call complaints may be the only step necessary, but could include other sources of data Turning movement counts, existing signal timing sheets, “before” travel time runs, signal timing policy, etc… 3 Model Development Field observation Build signal timing model, typically using a software tool like Synchro or TRANSYT-7F.

The context of the term policy is to support strategic objectives, and do not represent global applications in most cases. Engineering judgment should be used in concert with policy development and applications in the signal timing realm. This chapter describes the relationship between transportation policies and signal timing applications, summarized in Figure 2-1. S. Field Operations & Outcomes ~ CJO I I ~ P br Fee~b~~k I I I OS E o ~ Q ~ ~ Ql Q. I APPLICATION : ---------------------------, This chapter contains five sections.

The use of 20-year-old technology and infrastructure may satisfy the requirement for the signal to display green, yellow, and red, but it may not offer the opportunity to efficiently operate the system or provide preferential treatment for a certain type of user to meet the policies and desires of the community. In most cases, upgraded equipment improves the efficiency for staff to manage the system, assuming the staff is properly trained to operate the upgraded equipment. These efficiencies are observed with updating traffic signal timing plans, developing new strategies to improve transportation, and improving customer service.

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