Laser device takes on tailgating

     A growing number of law enforcement agencies are discovering the benefits of a new tool for an old traffic enforcement problem: following too closely. For years, traffic officers have struggled to bring tailgating violators to justice in courts...


     A growing number of law enforcement agencies are discovering the benefits of a new tool for an old traffic enforcement problem: following too closely. For years, traffic officers have struggled to bring tailgating violators to justice in courts, but without definitive proof their efforts have been stymied.

     The problem is that there was no means of measuring the speed and distance between the offender and the car ahead of him or her. More precisely, officers have been powerless to consistently enforce the highway safety industry's 3-second rule. This rule is a safety guideline applied to vehicles on major roads or highways that suggests the minimum distance a driver should be from the vehicle in front of him or her. Following this rule, the distance traveled in 3 seconds is the minimum distance. Without a detection method to enforce the rule, visual determination of vehicle separation distances is subjective, and relies on the judgment of the officer.

     Speeding, and its most formidable accomplice, tailgating, receive top billing as factors in today's grim highway accident and death statistics. The National Highway Traffic Safety Administration (NHTSA) cites speeding as a contributing factor in approximately 30 percent of fatal crashes. In addition, the National Road Safety Foundation reports aggressive driving behaviors, from which road rage and possibly tailgating have emerged, are linked to half of all car crashes.

     Barbara Harsha, executive director for the Governors Highway Safety Association (GHSA), is distressed about speeding based on statistics that highlight the issue. "[Speeding factors into] about a third of all vehicle-related fatalities and it's been at that level for the last decade, which says that we're not making any progress," Harsha says.

Exposing tailgating

     During the past few years, Centennial, Colorado-based Laser Technology Inc.(LTI), a maker of commercial speed detection laser systems, has developed a product called "Distance Between Cars" (DBC), a software code built into the company's lasers that can calculate accurate measurements between vehicles, both in distance and time. According to LTI, Distance Between Cars measures the back-to-front bumper separation between two vehicles. To date, the company's DBC software is the only innovation of its kind within the LIDAR (short for light detection and ranging) category of speed enforcement tools able to pinpoint tailgating infractions and withstand courtroom scrutiny.

     Officer Jeff Kreutzer of the Golden (Colorado) Police Department says he and his four-officer traffic unit have seen a rise in rear-end collisions on high-speed, four-lane highways with traffic lights in Golden and the surrounding area. "We're seeing a lot of [rear-end] collisions at those traffic lights because people aren't paying attention to whether or not they're too close to the front car," Kreutzer says. "The rear-end collisions have tripled roughly over the last four years."

     Golden's police department recently acquired an LTI UltraLyte 100 LR laser equipped with the DBC capability. In the DBC mode, the traffic officer aims the UltraLyte speed laser at the lead vehicle and takes his first measurement. The speed of the first vehicle is displayed on the LCD and in the scope. The laser then measures the second (trailing) vehicle. When the officer has taken the second measurement, the laser will display the speed of the second vehicle and the time between vehicles in seconds.

Accident-prone areas

     Kreutzer reports his traffic unit is targeting the jurisdiction's accident-prone areas more heavily with DBC versus an open stretch of highway. Thus, vehicles inbound to traffic lights and merged lanes are the unit's main targets.

     "We're looking for a consistent distance [between vehicles] for 1/4 to 1/2 mile," explains Kreutzer. "I'm able to take two readings [with the laser] within that interval. The first reading will just be a time interval between them, and in the second one I'll have all the data," he adds. "[The laser] just confirms what we're seeing and that it wasn't just a moment in time."

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