Intelligent Transport Systems (ITS)
Journey Time Analysis (JTA)
Journey Time Analysis (JTA) and Average Speed (AS) are key applications of traffic monitoring and management of which Electro Automation is a leading solution provider. Our solutions provide real time travel and speed information on vehicles travelling along open roads and motorways and through urban and city centre areas.
Average Speed Measurement
In an average speed over distance application the Electro Automation
solution
calculates the speed of the vehicle using the standard journey time formula. This
speed is derived from knowing the journey time over a known distance. The actual
speed can be measured against a user definable speed limit set within the system,
if a violation occurs the system can generate an alarm, store the information and
display a warning to the driver that they have exceeded a defined speed limit.
Key Features needed for an effective Journey Time
Analysis (JTA) System
* Modular Design
* Single or Multi-lane solutions
* User Friendly Display
* Accurate Calculations (within 2% per 2Km)
* Vehicle Recognition Databases
* Statistical Reports
* Reliable Performance (accurate image capture)
* Interfacing to other ITS
* Number plate imaging options
Downloads
JTA Brochure
JTA Specification Sheet
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Calculating Journey Time
Average journey times are calculated from the individual journey times at
user definable intervals. Results are presented as average journey
times which are a sum of the individual journey times divided by the number
of individual journey times.
n
Ja = ∑ Ji /n
n=0
where:
Ja is the average journey time
Ji is the individual journey time
n is the number of valid individual journey times in
the time-span sample.
The average journey speed for each segment is calculated by dividing the
distance between the measuring points (entered manually at set up) by the
calculated average journey time.
Average journey times are presented on a road segment basis. The total
average journey for the road is the sum of the segment average
journey times.