9. Unlike pre-timed signals, these signals adjust signal timings in response to
ID: 1714176 • Letter: 9
Question
9. Unlike pre-timed signals, these signals adjust signal timings in response to information provided to the traffic signal controller by detectors. Name this type of signal. 10. Determine the equivalent single axle loads (ESALS) on a rigid pavement for an 18-wheeler with 12 kips on the steering axle, 36 kips on the tractor's tandem axle, and 32 kips on the sem trailer's tandem axle. The fourth-power formula for tandem axles on rigid pavement has a reference weight of 29,000 pounds vs. the 33,200 pounds used for flexible pavement. Use the image provided below to understand the placement of the 18-wheels and the tandem axle. 3 10Explanation / Answer
9. Fully actuated control - This detection is used for intersections with
moderate to high speeds where dilemma zone
protection is appropriate. Mainline detection allows
for a variable mainline phase length to correspond
with traffic flows on a moment by moment basis.
Cycle and all phase lengths (and therefore splits)
are allowed to correspond to traffic flows.
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