Engineering Handbook
ASTM
What is American Society for Testing and Materials?
This type of flow occurs when the arrival flow exceeds the capacity of a point or segment
What is over-saturated flow?
TMA
What is a Truck Mounted Attenuator?
The road marking that accompanies a stop sign at an intersection
What is a Stop Bar?
This type of device registers the presence of a pedestrian without requiring them to push a button
What is a passive detection device?
Normal deceleration rate for a passenger car
What is 10 ft/s/s?
LOS for basic, weaving, merge and diverge segments of a freeway is defined in terms of this traffic flow variable
What is density?
These are the four areas defined for traffic control within a work zone
What are advance warning area, transition area, activity area and termination area?
This percentile speed is used to determine signal timing for pedestrian
What is 15th percentile?
This is the service measure for off-street facilities used exclusively by pedestrians
What is Pedestrian Space?
This is the distance from the front to the rear axle of a passenger car
What is wheelbase?
A bus with two body sections that allow bending around curves
What is an Articulated Bus?
For a two lane closure of 11 ft. lanes on a 45 mph roadway, this is the maximum suggested spacing of channelization devices on a tangent
What is 90 ft.?
CFI
What is a Continuous Flow Intersection?
Streets that are dedicated to pedestrian use on a full- or part-time basis
What are Pedestrian Zones?
Driver eye height for a truck
What is 8 ft.?
A form of transit preferential treatment characterized by a short bus lane section and advance green indication
What is a Queue Jump?
When used for nighttime purpose, flags shall be of this color
What is retroreflective red?
The reduction in number of conflict points when a four-leg signalized intersection is converted to a roundabout
What is 24?
The number of other path users traveling in the same direction as an average bicyclist
What are active passings?
The basic elements of highway geometric design
What are alignment, sight distance, cross section, and intersections?
A technique to reduce the shock waves that typically occur when traffic abruptly slows upstream of a bottleneck or for an incident, through the use of variable speed limits or advisory speed signs
What is Speed Harmonization?
These devices mitigate the effects of errant vehicles that strike obstacles, either by smoothly decelerating the vehicle to a stop when hit head-on, or by redirecting the errant vehicle
What are Crash Cushions?
The number of parking spaces is a function of curb length and this
What is angle of parking?
The buffer pedestrians give themselves to avoid obstructions or other pedestrians
What is shy distance?