Traffic Volume Study
Traffic Volume Studies
Traffic Volume Studies
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Engineers often use counts of number of vehicles or pedestrians passing a point, entering an intersection, or using a particular facility such as travel lane, crosswalk or sidewalk. Counts are usually samples of actual volumes, although continuous counting is also sometimes performed.
Manual Observation
Typical equipment needed for manual counts are: Tally Sheets, or
•
Mechanical Count Boards, or
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Sampling periods may range from a few minutes to a month or more.
Electronic Count Boards
1 4
Traffic Volume Studies
Traffic Volume Studies
The two basic methods of counting traffic are: Manual observation Automatic recording
Manual Observation
Mechanical Count Board
2 5
Traffic Volume Studies
Manual Observation
Traffic Volume Studies
Manual Observation
Many types of counts require classification that are obtained more easily and accurately with trained observers. Examples include vehicle occupancy, pedestrians, turning movements, and vehicle classifications. Other reasons for conducting manual counts are time and resources.
3
Electronic Count Board
6
1
Traffic Volume Studies
Manual Observation
Traffic Volume Study
Daily Volumes and Their Use
Manual traffic counting requires trained observers. They must be relieved periodically to avoid fatigue and degraded performance. Breaks of 10 to 15 minutes should be scheduled at least every 2 hours. If data collection period is more than 8 hours, breaks of 30 to 45 minutes should be allowed every 4 hours.
A common time interval for volumes is a day. Daily volumes are frequently used as the basis for highway planning and general observations of trends. Traffic volume projections are often based on measured daily volumes.
7
10
Traffic Volume Studies
Automatic Recording
Traffic Volume Study
Daily Volumes and Their Use (Contd..)
There are four commonly used daily volume parameters:
The automatic
Traffic Volume Studies
•
Engineers often use counts of number of vehicles or pedestrians passing a point, entering an intersection, or using a particular facility such as travel lane, crosswalk or sidewalk. Counts are usually samples of actual volumes, although continuous counting is also sometimes performed.
Manual Observation
Typical equipment needed for manual counts are: Tally Sheets, or
•
Mechanical Count Boards, or
•
Sampling periods may range from a few minutes to a month or more.
Electronic Count Boards
1 4
Traffic Volume Studies
Traffic Volume Studies
The two basic methods of counting traffic are: Manual observation Automatic recording
Manual Observation
Mechanical Count Board
2 5
Traffic Volume Studies
Manual Observation
Traffic Volume Studies
Manual Observation
Many types of counts require classification that are obtained more easily and accurately with trained observers. Examples include vehicle occupancy, pedestrians, turning movements, and vehicle classifications. Other reasons for conducting manual counts are time and resources.
3
Electronic Count Board
6
1
Traffic Volume Studies
Manual Observation
Traffic Volume Study
Daily Volumes and Their Use
Manual traffic counting requires trained observers. They must be relieved periodically to avoid fatigue and degraded performance. Breaks of 10 to 15 minutes should be scheduled at least every 2 hours. If data collection period is more than 8 hours, breaks of 30 to 45 minutes should be allowed every 4 hours.
A common time interval for volumes is a day. Daily volumes are frequently used as the basis for highway planning and general observations of trends. Traffic volume projections are often based on measured daily volumes.
7
10
Traffic Volume Studies
Automatic Recording
Traffic Volume Study
Daily Volumes and Their Use (Contd..)
There are four commonly used daily volume parameters:
The automatic