Describe the following types of traffic counts and when they are used. (a) screen line counts (b) cordon counts (c) intersection counts (d) control counts

Question

What will be an ideal response?

Answer 1

Screen line counts involve dividing the study area into large sections by drawing imaginary lines (screen lines) across the study area. Counts are then taken at each place a road crosses this line. This data is then used to detect variations in traffic volumes and flow direction attributable to changes in land-use patterns in the area.
Cordon counts are similar to screen line counts with the imaginary line completely surrounding an area, for example, a CBD. Counts are taken at each place a road crosses the line, giving information about vehicle accumulations within the area. The information from cordon counts can be used to plan for parking facilities, evaluate traffic operational techniques, and long range infrastructure planning.
Intersection counts are counts of vehicular turning movements and classifications at an intersection. The data gathered is used to develop signal timing and phasing plans for signalized intersections and for geometric design improvements.
Control counts are taken at strategically located locations chosen to obtain representative samples of traffic volumes for specific types of highways or streets. There are two types of control counts; major and minor. Major control counts are taken monthly with 24-hour directional counts being taken at least three days during the week.