Posted Speed Limit VATCS are installed to work in tandem with existing static regulatory signage, and are targeted at specific drivers travelling above a pre-determined safe speed threshold.
Drivers are not informed what speed they are travelling, rather they are advised of the posted speed limit with request to SLOW DOWN, further enhanced by dynamic flashing pairs of horizontal corner beacons.
VATCS employ microwave Doppler radar to detect vehicle approach speeds and use diagrams sizes and colors that are in line with the MUTCD to ensure a consistent and clear road speed management strategy.
Importantly the VATCS are not a replacement for static regulatory signage or to be used as a repeater they are a speed targeted supplementary advisory device.
Model Specific to road speed - one size doesn’t fit all
A full range of Posted Speed Limit VATCS models are available in 18 x 24” (400 x 510), 24 x 30” (600 x 750) and 36 x 48”(900 x 1200) sizes ensuring the sign is appropriate for the road speed. The signs are also available in dual diagram model options allowing different speeds to be re-enforced by time of day eg School Zone, Playground
Independently proven - long term effective
4mp/7kph reduction on average speeds maintained after 3 years - TRL 548 report 1/3rd drop in accident rates after 3 years-TRL 548 report
Dynamic Corner Beacons - attract drivers attention but keep message clear
An important feature of VATCS is recognising that drivers have a limited time to read and react to a warning message. This is why VATCS incorporate dynamic flashing beacons in each corner of the display to attract driver’s attention whilst importantly maintaining the warning message steady for 3 seconds.
MUTCD compliant - consistent approach
VATCS are in full compliance with the MUTCD and where deployed support a clear, consistent speed management strategy of already recognized static regulatory signs.
VATCS is the only traffic calming display technology that has been federally field tested on a large scale to prove long term effectiveness, with driver respect of the technology being maintained over a 5 year period.
Targeted Message - Drivers won't tune out and respond well to reasoned message
When not active VATCS blend into the background, drivers are only provided a warning when their speed dictates it to be necessary. It is proven that the best overall driver behavior change is attained when drivers see the message is reasoned and well thought out.
Clear Message - Drivers informed of speed limit and requirement to Slow Down
Importantly drivers aren’t told what speed they are travelling at, rather when required they are clearly informed of the posted speed limit in effect and the requirement for them to slow down to comply.
In addition to TRL548 report, dynamic curve warning VATCS displays were also selected to be nationally tested by FHWA across 8 states and VATCS are steadily becoming the common sense approach of choice for display based traffic calming across North America.