
CHAPTER 9 DRIVER REFERENCE 113
boxes should always be checked.
Below is a list of the controls located inside the Data Fields Enabled box:
Speed – e speed of each vehicle.
Volume – e number of vehicles that pass at a given point.
Occupancy – Average time occupancy. e percentage of time that vehicles are de-
tected during the interval.
Vehicle Class – e length of the vehicle.
Flow Rate – e volume of vehicles per unit of time. Specically, the vehicles per hour
per lane.
Headway – e average number of seconds between the fronts of the vehicles.
Density – e number of vehicles per lane traveling between two points at a given time.
Space Mean Speed – An estimate of the average of vehicle speed. e total distance
traveled (by multiple vehicles) in a certain section of a roadway, divided by the total
time required by the vehicles to traverse it.
Space Occupancy – Also known as Lane Occupancy. e given length of a roadway that
is occupied by vehicles at a point in time. It is a percentage of the given length. It equals
the lengths of the vehicles, added together, then divided by the given length of roadway.
Level of Service – How much of the road’s capacity is being used. e speed or ow,
relative to capacity. e Levels of Service are dened within the Autoscope setup.
Mikros Data Logger
e Mikros data loggers are used for applications such as loop only trac monitoring, axle-
based classication and high speed weighing in motion (see Figure 9.7).
Figure 9.7 – Mikros Custom Panel
Custom Fields
Location – A description of the place where the sensor is installed, which can be a
name or geographic coordinates.
Description – A description of the sensor’s location.
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