INSTALLATION ORDER
This is normally the first TTC device installed.
What is The first advance warning sign, typically Road Work Ahead?
This point should be located first before measuring the setup.
What is The beginning of the work space or critical closure point shown by the plan?
This is X spacing for signs for a 35 mph urban arterial roadway.
What is 350 feet?
At 25 mph with a 10-foot lane, the merging taper has this length.
What is 105 feet?
These features should be checked before traffic enters the new pattern.
What is Device placement, sign visibility, taper alignment, and clear travel path?
TTC devices are installed in this direction relative to traffic flow.
What is With the flow of traffic?
This table provides the needed buffer distance.
What is The stopping sight distance table?
This is X spacing for signs for a 40 mph rural roadway.
What is 350 feet?
Using a 105-foot L value, the rounded shifting taper has this length.
What is 55 feet?
These safety features must remain open and unobstructed around a flagger.
What is The escape route and required sight distance?
A TTC zone is normally removed in this direction relative to traffic flow.
What is Against the flow of traffic?
At 35 mph, this stopping sight distance and buffer are used.
What is 250 feet?
This is X spacing for signs for a 50 mph rural roadway.
What is 500 feet?
At 25 mph, tangent devices may be spaced no farther apart than this distance.
What is 40 feet?
Nonapplicable signs require this action during teardown.
What is cover or remove them promptly?
This explains why signs installed before the work area is occupied.
What is to warn road users before workers enter the area?
At 45 mph, a flagger must be visible from at least this distance.
What is 360 feet?
This is X spacing for signs for a 60 mph rural highway.
What is 500 feet?
This number of flaggers applies to the five-lane intersection plan on the exam require.
What is Three?
This is the reason removal proceed against traffic flow.
What is Workers remove downstream devices while advance warnings remain in place as long as needed?
Workers must verify this condition as installation progresses.
What is that each device remains visible and properly placed?
These three roadway facts are needed for many taper calculations.
What are Posted or operating speed, lane width, and the type of taper?
This is X spacing for signs for a 70 mph freeway.
What is 1,000 feet?
During the shown flagging operation, the intersection signal requires this setting.
What is set it to all-red flash or turn it off?
What is Workers remove downstream devices while advance warnings remain in place as long as needed?
Who is the responsible supervisor or qualified traffic-control authority?