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Barcode Automation readers will not be able to detect tailgating on their own. When vehicle detectors, such as ground loops or photodetectors, are interfaced with BAi readers it will be able to find vehicles that do not have a valid decal. However, for this to work the vehicle detector must be able to "see" each individual vehicle.
When two vehicles are very close together loops and photodetectors usually cannot separate them, so they will appear as one really long vehicle. The BAi Reader is dependent on the vehicle detector to sense when a vehicle is present, so if the detector is fooled by a tailgater the barcode reader will be fooled also.
Tailgating involves two or more vehicles moving through the entrance too close together, so the most effective solution is to make that difficult to do. A simple and economical method to reduce this is by implementing one or more speed bumps to try and force a gap between the vehicles.
The advantage to speed bumps is simplicity, economy, and reliability. When positioned correctly, a speed bump will dramatically reduce tailgating events, but will not emininate all tailgagincidents. A pair of speed bumps will be even more effective but may still not stop all tailgaters. The main disadvantages to speed bumps are (1) driver dissatisfaction and complaints about the bumps, and (2) the flow of traffic through the gate will slow down.
In addition, if the gate operator is slow to open, speed bumps will not be effective. For example, a wrought iron swing gate has a nice appearance, but it can take 30 to 40 seconds to open. When a gate takes that much time to open, traffic will naturally tend to "pile up" while waiting, which results in more tailgating.
A barrier gate generally opens quickly, within a second or two, which allows traffic to flow easily through the gate. With a gate operator this responsive, speed bumps are most effective at creating gaps between vehicles, which reduces tailgating.
It is nearly impossible to completely eliminate willfull tailgating, where a vehicle is moving slowly on purpose to allow a following vehicle to enter through the gate. Safety loops and other safety systems force the gate to remain open if a vehicle is in the way. These safety circuits are designed to protect people from injury and vehicles from damage, but they also help tailgating vehicles.
BAi recommends discussing with your preferred gate installation provider tailgating issues and possible changes that can help reduce them. If you don't currently have a preferred gate installer check our Vendor Listings.