| Consideration |
Significance |
| 1 |
What is the posted and practiced speed limit at the installation site? |
Vehicle speed determines (in part) the distance from the detector the warning sign must be placed to provide sufficient time for drivers to react to directions given. |
| 2 |
What exits, pull-offs or U-turns are available between the detector and obstruction? |
Availability of such options must be taken into account as courses of actions for overheight vehicle drivers and directions given to them accordingly. |
| 3 |
Will the detection system monitor one-way or two-way traffic across the roadway? |
Determines whether system must be direction discerning. |
| 4 |
What are the number of lanes in the direction of interest? |
May further determine distance required between detection and warning sign/exit if lane changing is involved. |
| 5 |
What is the height of the obstruction (clearance required) and is there the same clearance for each lane? |
The shape and/or contour of the obstruction or roadway may require more than one OVDS to monitor multiple heights or axis. |
| 6 |
Are there any weather or airport radars within 1/4 mile of the OVDS installation site? |
Since both the Visible Red and Infrared detectors are made from silicone substrate, it may be possible to generate a false alarm if the detector is looking directly into the radar. |
| 7 |
What will be the smallest sun angles encountered with respect to the detectors' site? |
The Visible Red detectors need a 3° clearance from direct sunlight and the Infrared detectors require an 8° clearance. |
| 8 |
Is there 115 VAC power available on both sides of the road at the installation site? |
If AC power is not available, solar power may be an option. There can be a combination of both AC and solar power within the same system if necessary. |
| 9 |
What is the desired alarm time? |
This is the cumulative time requirement considering speed, distance, number of lanes and required driver response. Our systems offer 1-30 sec, 5-60 sec as a standard feature and custom times up to 5 minutes at no additional charge. |
| 10 |
Is remote reporting of an overheight detection and/or fault condition required? |
If so, this requirement dictates choice of system. |
| 11 |
What are the local traffic patterns? |
These may influence directions given to drivers in overheight situations. |
| 12 |
Trigg Industries welcomes the opportunity to discuss any overheight application. |
Overheight Vehicle Detection Systems 
