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3. Findings from Practitioner Survey
Pages 36-42

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From page 36...
... Figure 7 presents the responses to this question. Not all of the respondents answered this question, but nearly all of those who did reported high or moderate levels of growth, with only a single respondent indicating a mixed level of growth and none of the respondents reporting stable growth or a condition of economic distress.
From page 37...
... However, there was representation among other potential categories, including planning, design, construction, management, and maintenance. Traffic Operations / TSMO 34 Traffic Engineering 25 Program Management 8 Long-Range Planning 7 Work Zone Design 3 Construction Management 3 Roadway Design 2 Roadway Maintenance 1 Other 3 0 10 20 30 40 Number of Responses Figure 8.
From page 38...
... None of the respondents indicated that they retime none of their signals, but about 30% of the respondents stated that they retime 10% or fewer of their signals each year. 100% Cumulative Frequency 80% 60% 40% 20% 0% 0% 20% 40% 60% 80% 100% Percentage of Signals Retimed Annually Figure 10.
From page 39...
... • Similarly, for retiming existing signals, a majority of respondents still indicated that they usually carry out LOS analyses, although there were more indicating never or sometimes. Never 0 Existing Intersection New Development Sometimes 2 About half the time 0 Most of the time 9 Always 23 Never 2 Retiming Existing Adding Signals to Sometimes 5 About half the time 2 Most of the time 8 Always 17 Never 2 Sometimes 9 Signals About half the time 3 Most of the time 9 Always 14 0 5 10 15 20 25 Number of Responses Figure 11.
From page 40...
... Respondent policies regarding RTOR estimation procedures. Next, the survey asked respondents to indicate how they performed RTOR estimation.
From page 41...
... One respondent from a vendor indicated that they provide an RTOR report that can help identify RTOR volumes using detector data. Two respondents indicated that they use methods contained in NCHRP Report 457: Engineering Study Guide for Evaluating Intersection Improvements (Bonneson and Fontaine 2001)
From page 42...
... The practitioner survey indicated that LOS estimation is an important element of signalized intersection management, especially for new traffic signals, and remains important for retiming existing signals. A majority of respondents stated that LOS analyses were part of those activities.


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