Structures
The weakened section of a sign post designed to allow the post to rotate upward when impacted by a vehicle.
What is a hinge?
The area between the outside shoulder edge and the right-of-way limits.
What is roadside?
NCHRP stands for this
What is national cooperative highway research program?
MUTCD stands for what
Manual on uniform traffic control devices
What does the acronym ITE stand for?
Institute of Transportation Engineers
A structural quality or feature that makes the structure easily broken upon impact.
What is frangible?
What is the minimum widening for traveled-way?
2 ft
This type of transportation is most useful for mobility
What are freeways or arterials?
DHV stands for this
Design Hourly Volume
What is the length of roadway needed to accomplish a change in outside lane cross slope from zero (flat) to full super-elevation?
Super-elevation Runoff
A structural element at or near the bottom of a post or pole which will allow release of the post from its base upon impact.
What is a slip base?
What are considered to be the appropriate height of driver’s eye for average drivers and large truck drivers?
Average drivers – 1.08 meters, 3.5 feet
Large Truck drivers – 2.33 meters, 7.6 feet
The arterial system can be stratified into these three classifications.
What are
Interstate Highways
Freeways and Expressways
Other principle arterials?
CTR means this
What is centerline turning radius
What is the length of roadway needed to accomplish a change in outside lane cross slope from the normal cross slope rate to zero (flat)?
Tangent runout
This level of service is usually considered the roadway’s operational capacity.
LOS E
What is it called when the rear wheels do not precisely follow the same path as the front wheels when the vehicle traverses a horizontal curve or makes a turn?
Off-tracking
Where is widening applied on spiral curves?
Inside edge or divide equally on either side of the centerline
TCD stands for this
Traffic control devices
What is the purpose of a three second Loading Pedestrian Interval (LPI)?
When cars are allowed to turn at the same time as pedestrians are allowed to cross an intersection, it puts the pedestrian well into the crosswalk and more visible to drivers 3 seconds before the vehicles are allowed to turn.
A paved non-continuous lane that allows vehicles to accelerate when they enter the through-traffic lane of the roadway.
Acceleration Lane
These are the four methods of obtaining superelevation.
1.Crowned – Traveled way revolved about the centerline
2.Crowned – Traveled way revolved about the inside edge
3.Crowned – Traveled way revolved about outside edge
4.Straight Cross Slope – Traveled way revolved about outside edge
This value is commonly used for a perception-reaction of a driver.
2.5 seconds
DDHV means what
A phenomenon that occurs within a traffic stream anytime the stream experiences a temporal or special change in flow resulting in change of speed, density, and flow.
Traffic shockwave