The SRH System collects a point cloud of data each time it scans the road. Each of these unique points can be measured by their X, Y and Z coordinates to produce a realistic model of the surrounding environment. Mandli’s software takes this data and analyzes it for relevant points, and then extracts the vertical and horizontal clearance measurements. This system is the next step in Mandli’s well-established clearance measurement history. The previous Vertical Measurement Clearance System used only two pairs of sensors, as opposed to the SRH’s 64 sensors, and could only take vertical clearances of a single lane in each pass.

The current method used by many departments for vertical clearance measurement (manual rod survey performed by individuals) requires surveyors to close the lane of travel where vertical clearance is measured.  This procedure is both costly and time-consuming, and it compromises the safety of the personnel as well as passing motorists. Poor or inaccurate data can cause costly damage to vehicles and highway structures. On the other hand, overly conservative routing inhibits economic activity and provides the impetus for unauthorized route modifications. The SRH System provides a far superior method to older collection practices.

The video above illustrates several of the structures that can be measured by the SRH System, including both the vertical and horizontal clearances of bridges, overhead signs, vegetation and guardrails. All of the items are automatically scanned in real-time as the vehicle passes them, and the SRH post-process software displays the data as a 3D representation. The video shows how the software automatically measures clearances as each new section of road is displayed, saving the time and money needed to perform any manual measurements, while remaining extremely accurate. Note that the measurements are displayed in English units, but can be easily converted to metric.