Safety Manual - Boone County, Missouri
count data is used to determine the frequency of vehicles on county maintained
roads. Counts will be taken on roadway segments between intersections
or other pertinent structure that may significantly affect the flow of
traffic. The traffic count data will include, at a minimum, locations,
volumes, times, and dates. Upon implementation of the GIS system, the
traffic count information will be posted on a digital map of the County.
Procedure to Obtain a Traffic Count
are four situations that may require the County to complete a traffic
count on a certain road. Within each situation, a procedure is outlined
to provide traffic count information and/or to complete a traffic count
study. Traffic counts will not be taken during the winter months due
to snow removal operations. These situations and procedures are as
Yearly Scheduled Counts: Traffic counts will be
completed on all County maintained arterial and collector roads once
every three years; the traffic counts will be completed on rural roads
with a current average daily traffic (ADT) greater than 200 vehicles
per day once every three years; and the traffic counts will be completed
on the rural roads with an ADT less than 200 vehicles per day once
every six years.
Citizen Request: A citizen will be supplied with the of
the most recent traffic count, the date of the traffic count, the
location of the traffic count, and the anticipated year of the next
count for the particular road requested. This information will be
supplied, in writing, to the citizen. If the citizen feels that
the traffic volume has significantly changed since the date of the
latest traffic count, the citizen may request, in writing, for the
County to complete a new traffic count of that particular road.
The written request must include the reason the citizen believes the
traffic volume has significantly increased since the most recent traffic
count. The County will review the request and if deemed applicable
will complete a new traffic count and supply the citizen, in writing,
the information of the new traffic study. If the County does not
agree with the citizen’s request, the County will supply, in writing,
the reason that the County does not deem the traffic study necessary.
Engineering Safety Study: A traffic count may be
required in conducting an engineering safety study of a road. The
traffic count procedure will follow the requirements of the particular
Joint Boone County/City of Columbia Study :
A traffic count may be completed to assist the City of Columbia
on a thoroughfare study. The traffic count will consist of a 24-hour
count on hourly intervals to determine the ADT of County maintained
roads near the city limits. This joint traffic count is completed
once every three years.
Completion of a Traffic Count
most situations, the traffic counts will be taken on a seven-day interval
and from that information an ADT volume will be derived. The traffic
count information will be recorded on an hourly basis unless the study
requires the information to be recorded on the quarter hour basis.
On certain occasions, a 24-hour or a 48-hour recording period with the
data recorded on an hour or quarter hour basis may be used.
tube type counters can be used to determine ADT and, if desired, speed
or type of vehicle counted. The traffic count equipment will be placed
near the intersections of roads or in the vicinity of structure anticipated
to cause a wide variation in traffic counts. The equipment will be
placed such that it can be secured to a permanent fixture near the roadway.
Consideration should be given to anticipated movement of the vehicles
and structures that may affect the traffic flow (i.e. business, subdivision).
A summary of the weather for the week of monitoring should also be
recorded. A map of the area should be sketched. The map should include,
at the minimum, the follow items:
Road names and numbers,
Physical locations of the counters,
GPS locations of the counters,
North arrow, and
Any other structures that may affect
the flow of traffic.
vehicle magnetic imaging (VMI) counters can be used for engineering
studies that require more information than provided by the tube type
counters. The VMI counters record the volume, speed, vehicle length
classification, road surface temperature, road surface conditions (wet
or dry), vehicle presence, and road occupancy. The VMI counters will
only be used on paved roads and the road lanes need to be designated
prior to placement of the VMI counters. As with the tube type counters,
the VMI counters should be place near intersections or near structures
that are anticipated to cause a variation in traffic flow. A map,
as discussed above, should be used to record the field information.
the traffic count information has been obtained, the ADT should be recorded
in yearly traffic count database and the information should be updated
in the GIS system. All other information should be used and recorded
as needed for the various traffic studies. A paper copy of the map,
the data collector output, and any related correspondence should be
placed in the Traffic Count File.
to Table of Contents
Map | County
Officials | County
| Auditor | Clerk
| Collector | Commission
| Human Resources | Planning
Prosecuting Attorney | Public
Works | Purchasing
| Public Administrator
| Recorder | Sheriff
or Comments? Email Webmaster
, Copyright © 2000 Boone County, Missouri. 801 East Walnut Columbia, MO
65201 USA. All rights reserved.
August 3, 2009