Traffic Control Flashcards
When less than five parking spaces are provided, one shall be how many feet wide?
14 feet
When the sign is in path of travel it should be posted at a height of ___ inches minimum.
80 inches or 6’-8”
Beveled lip, the lower end of each curb ramp shall have a ___inch lip beveled at 45 degrees for visual impairments.
1/2 inch
In accordnace with ADA guide lines of a parking lot designed to park 26 to 50 vehicles the required number of accessible ADA spaces would be?
2
The slope of a curb ramp should not exceed?
1 -12 units
Length of a paking space shall be at least how many feet long?
18 feet
The international accessibility symbol shall be ___ sq. inches minimum.
70 square inches
Parking spaces and access aisles shall not exceed a slope of?
2%
Signs displaying “unauthorized parking” shall be 17 inches by 22 inches minimum with letter___ inches minimum in height.
1 inch
A TTC plan should be designed so that vehicles can travel through the zone with a speed limit reduction of no more than…
10 mph
Four areas of a TCC zone?
- The advance warning area
- The transition area
- The activity area
- Termination area
Typical distances for placement of warning signs in advance warning area?
Freeways - 1/2 mile
Urban streets - 4 to 8 Times the speed limit in mph
Temporary Sign Placement - location and height?
Located on the right-hand side of the roadway.
- Minimum height from bottom of the sign to the elevation of pavement/sidewalk
- 5 feet rural areas
- 7 feet everywhere else
Recommended advance warning sign minimum spacing for:
- Urban low speed
- Urban high speed
- Rural
- Freeway
- 100 feet
- 350 feet
- 500 feet
- 1,000 feet
Buffer space
Is an area that separates road user flow from the work space and might provide some recovery space for an errant vehicle.
Stopping sight distance as a function of speed?
20 mph =
35 mph =
55 mph=
75 mph =
20mph = 115 feet
35mph = 155 feet
55 mph = 495 feet
75 mph = 820 feet
Formula for determining taper length?
- 40 mph or less
- 45 mph or more
40 mph or less:
L = WS^2/ 60
45 mph or more:
L=WS
Where,
W = width of offset in feet
S = posted speed limit
The maximum distance in feet between devices in a taper should not exceed _______ the speed limit in mph
1 times
One-lane, two-way traffic taper and a down stream taper should have a taper length range of what in feet?
50 feet minimum, 100 feet maximum
When it is not possible to maintain a 60” width for a pedestrian pathway, a ___” x ____” passing space should be provided every _____ feet
60” x 60”, 200 feet
Signs and other devices mounted lower than 7 feet above the temporary pedestrian pathway should not project more than ____” into accessible pedestrian facilities
4”
Lateral locations of signs from shoulder/road/sidewalk?
- Rural
- Rural with advisory speed plaque
- Business commercial or residential
- Business commercial/residential - no curb
- 6 to 12 feet
- 6 ft min. From shoulder
- 2 feet
- 6 to 12 feet
If portable mounting signs do not meet minimum height requirements, they cannot be used longer than?
3 days
The bottoms of a sign mounted on a barricade or other portable support shall be at least _____ above traveled way.
1 foot
