PALMETTO, FL. April, 2008 – The California Department of Transportation (CalTrans) recently
conducted field tests of Quixote Traffic Corporation’s new AxleLight™ Laser Sensor on the heavily travelled Route 101 Freeway near downtown Los Angeles, with positive results.

The test was conducted where the Average Annual Daily Traffic (AADT) is 132,000 vehicles, and also the site
of a Quixote Traffic ADR6000 station, a highly accurate loop-based vehicle counter and classifier, used as a baseline
to which the AxleLight laser sensor results could be compared.

The tests show that for volume counting, the AxleLight sensor did an excellent job. It is
especially useful for counting hazardous freeway to freeway connectors. The results were
outstanding on a four-lane urban freeway with congestion.

The AxleLight is a portable, infrared, ranging laser that is mounted close to the ground on
one side of the roadway. It detects the number of axles on vehicles without anything tangible
Quixote Traffic Corporation’s AxleLight™ Laser Sensor Put to the Test on 101 Freeway 2 of 2
stretching across or installed in the roadway and transmits the information to Quixote Traffic’s
Automatic Data Recorder (ADR). The sensor allows users to perform challenging traffic studies
without venturing into or crossing a hazardous roadway to install road tubes or reflectors.

During a 21-hour test, a single AxleLight laser sensor was 99.6% accurate compared to the baseline, counting 107,240 vehicles vs. 107,673 for the ADR6000, a difference of only 433 vehicles. During a 23-hour test with dual lasers performing classification, the AxleLight sensors were 96.7% accurate, counting 121,906 vehicles vs. 126,079, a difference of 4,173
vehicles. Overall for both tests, the AxleLight was 98.0% accurate
counting 229,146 vs. 233,752 vehicles. The chart at right shows the comparison for both setups.

When it came to the more complicated task of classifying vehicle types, the AxleLight’s results were more typical of other vehicle data detectors, working well in normal traffic but losing some accuracy due to closely-spaced vehicles in heavy traffic. The ADR6000 is one of the only devices that can accurately count closely-spaced vehicles in stop and go traffic.

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