SmarTek Systems SAS-1 Installation at the Traffic Monitoring Site - Manual (Page 3)

SmarTek Systems (www.smarteksys.com) 3
Installation at the Traffic Monitoring Site
Existing highway structures (light poles, sign bridges, overpasses, etc.) are suitable for mounting
the SAS-1 for traffic monitoring. There is no need to mount the SAS-1 over any active lanes.
From the “side fire” position, the SAS-1 can provide effective lane by lane monitoring for up to
five (5) lanes. The typical mounting height (Figure 1) for the SAS-1 should be 25 to 35 feet (at
least 34 ft if four or five lanes are to be monitored). The horizontal distance from the first active
lane should be nominally 10 to 20 feet. Mounting the SAS-1 just off the shoulder is a good
position. Higher mounting positions reduce possible occlusion of smaller vehicles by tall trucks.
Sensor Mounting for Multi-Lane Monitoring
The basic mounting bracket for the SAS-1 consists of a 2 inch diameter aluminum tube and a
cast aluminum flange (Figure 2). The flange should be matched to the structure the SAS-1 is
mounted on (curved to fit different diameter structures or flat to fit rectangular structures or
concrete walls). The flange may be attached to the structure via stainless steel strapping or bolts.
The tube screws into the flange and is locked in place with a set screw. For mounting SAS-1 on
a round structure such as a light pole or sign bridge, the orientation of the flange depends on
whether the mounting position is on a vertical member (i.e. light pole) or on a horizontal member
(i.e. cross member of a sign bridge).
Figure 1 SAS-1 Mounting Position Recommendations
Recommended Install Height (H) of SAS-1 for Multi-Lane Monitoring
Distance (X) from
Nearest Lane
6 ft
12 ft
18 ft
24 ft
30 ft
34 ft
36 ft
38 ft
40 ft
44 ft 30 ft
32 ft
34 ft
36 ft
38 ft 26 ft
28 ft
30 ft
32 ft
34 ft 24 ft
26 ft
28 ft
28 ft
30 ft 20 ft
22 ft
24 ft
24 ft
24 ft
5 4 3 2 1
Number of Lanes Monitored
H
X