measure of travel along a section of road.

used for preparing traffic flow maps and determining trends.

When traffic count of very long duration is required, one may resort Video cameras may be used to take footage of the traffic flow. Counts may then be carried out later through either tally or manual method while watching the video

When traffic count of very long duration is required, one may resort to automatic counters through the use of detectors.

diameters that are much smaller than rotaries and therefore allow much lower speeds.

have large diameters that are usually greater than 300 ft, thereby allowing speeds exceeding 30 mi/h, with a minimum horizontal deflection of the path of the through traffic.

is used to estimate maximum flow rate and determine the characteristics of peak hour volumes

used for determining modal split, estimating effects of heavy vehicles on capacity, determining correction factors for automatic counts.

Spot sleep studies

three intersection design categories

a mechanical device useful when volume is high. Counters may be of single or multiple type.

a defined area between traffic lanes that is used to regulate the movement of vehicles or to serve as a pedestrian refuge.

AADT

used for determining directional distribution for capacity analysis, signal timing, justifying traffic control, etc.

VC

Considered as the simplest and sometimes the most practical in the absence of any mechanical or automatic counting devices.

Presentation of traffuc volume

are conducted to determine the number, movements, and classifications of roadway vehicles at a given location.

used for evaluating capacity deficiencies, geometric design or improvement of streets and intersections.

ADT

records volume with respect to the type of vehicles, for example, passenger cars, two-axle trucks, or three-axle trucks.

They provide the basic information necessary for meaningful planning, design and analysis of highways and other road transportation infrastructures.

used to determine the number of vehicles and/or persons entering or leaving an enclosed area

is the average 24-hour counts collected every day in the year.

PHV

are used for signal timing, designing or improving geometry of intersections, planning turning prohibition, analyzing high accident intersections.

maximum number of vehicles that pass a point on a highway during a period of 60 consecutive minutes

Types of Data Collected:

the average 24-hour counts collected over a number of days greater than 1 but less than a year.

Methods for Conducting Spot Speed Studies

circular intersection that provides a circular traffic pattern with significant reduction in the crossing conflict points.

VMT