T
IME
O
VER
D
ISTANCE
M
EASUREMENT
Electronic Copy of LTI’s UltraLyte User’s Manual – 7
th
Edition June 1998
25
Time-Over-Distance Measurement
Time-Over-Distance (TOD) is an alternative method
of measuring the speed of a moving vehicle. In TOD
measurements, you do not directly measure the
vehicle’s speed. Instead, you determine the distance
between two reference points, and use the precise
timing of the UltraLyte to measure how long it takes
the vehicle to travel that distance.
The basic procedure is this:
1. Locate two suitable reference points.
2. Enter the distance between the two points (the
“reference distance”) into the instrument.
3. Position yourself at a convenient spot where you
can clearly see both reference points.
4. Signal the instrument to start timing when the
vehicle passes the first reference point.
5. Signal again when the vehicle passes the
second point.
6. The instrument displays the vehicle’s average
speed over the course.
For Internal Use Only. Not for Distribution.
Summary of Contents for UltraLyte
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