Service summary
Queue length surveys measure the extent of queues at defined approaches using vehicles, metres or another agreed unit.
When it is used
Use them to describe observed congestion patterns at junctions, accesses or operational constraints.
Methodology
Fix the reference point, unit, sample/interval method and all included approaches.
Inputs and source requirements
Provide a plan, approach labels, reference point, unit, timing and output requirements.
Movements and classifications
Queue records normally focus on an approach; lane or class splits require an explicit rule.
Time intervals
Apply the approved maximum, average or sample rule consistently within each interval.
Typical deliverables
Approach queue tables, reference-point note, peak observations and exception notes.
Quality control
Check every approach, period, unit and source limitation before finalising.
Limitations
A queue length record does not by itself establish delay, capacity or cause.
Privacy and security
Source footage is handled through approved project processes.
Frequently asked questions
Can queues be measured from video?
Yes, when the queue and reference point remain visible.
Does a queue count calculate delay?
No. Delay or capacity requires a separate method and assumptions.
Can queues be split by lane?
Yes, if lane boundaries and the full queue remain visible through the observation period.
Can queue formation and dissipation be shown?
Yes, where timestamps and visibility support an interval-based event record.