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The time and length that a specific location should be counted depends upon the
data desired and the application in which the data are used.
Counting periods vary from short counts at spot points to continuous counts at
permanent stations.
Hourly counts are generally significant in all engineering design, while daily
and annual traffic is important in economic calculations, road system
classification and investment programmes.
Continuous counts are made to establish national and local highway use, trends
of use and behaviour and for estimating purposes.
Some of the more commonly used intervals are:
- 24-hour counts normally covering any 24-hour period between noon Monday
and noon Friday.
If a specific day count is desired, the count should be from midnight to
midnight.
- 16 hour counts usually 5:30 am to 9:30 pm or 6 am to 9 pm.
- 12 hour counts usually from 7 am to 7 pm
- Peak Period counting times vary depending upon size of metropolitan area,
proximity to major generators and the type of facility.
Commonly used periods are 7 to 9 am and 4 to 6 pm.
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