What is queue length surveys ?
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Queue Length Surveys
A typical
queue length survey involves recording the number of vehicles in a queue just
prior to the red signal changing to green for one or more legs of an intersection.
When there are multiple lanes, the number of vehicles in the longest queue
only, or in each lane separately, can be recorded.
Queue
length surveys can require one of the several techniques to be applied and thus
produce varying data outcomes. The objective of the survey in terms of the key
output requirement will dictate what form of data collection is most
appropriate. The most typical approach is the simple observation of recording
either how many vehicles are in a queue or the physical extent of the queue
just prior to the red signal changing from red to green (or at the minute
change for priority sites), with the data being collected per lane and per
approach to the feature/junction.
Classification Surveys:
Traffic
count and classification surveys involve determining the number of vehicles for
a particular vehicle classification type. Classification categories may
be as simple as 'car' and 'truck' or extend up to the full 12 Austroads classifications.
Data collection techniques may include:
·
Manual
field observation
Our
experienced staff can help you with the survey design, to ensure the best data
collection outcomes are achieved relative to your survey needs.
Queue Length Survey Methodology by Manual Observation:
- Worst case queue recorded by the number of
vehicles within a 15 minute period and by lane where applicable.
- Actual queue (spot) at each 15-minute interval
and by lane where applicable.
- Queue length determined by stationary vehicles
at a red light stop up to and including the point where by the light.
- changes to amber and by lane where applicable.
- Queue length to be recorded in metres until the
vehicles are out of sight and by lane where applicable are out of sight.
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