Warning!
When transitioning from a rural to an urbanized area, you may encounter this type of sign to change your speed?
Reduced Speed Limit Ahead Sign
Increasing in popularity, a metric used to tax road users as an alternative to fuel taxes, denoted as VMT
Designers presumed roads to be safe if they complied with these two guides
MUTCD and the AASHTO Greenbook
A study that uses counts of vehicles passing a point, entering an intersection, or generally using a facility
Volume study
The number of feet in one station
100
This sign is used in a series to provide additional emphasis and guidance around a horizontal curve
A chevron sign
Abbreviated HOV, this type of lane is designated for vehicles meeting a threshold which is typically two or three persons
High-Occupancy vehicle
The three most critical data for measuring safety are road characteristics and these two
Crashes and traffic volume
This type of intersection study can help determine the storage length needed at an intersection, as well as provide a measure of traffic signal efficiency
Queue length study
The AASHTO standard perception-reaction time used to calculate stopping sight distance
2.5 seconds
On a two-lane road that lacks sight distance to maneuver around a slower-moving vehicle, this pennant-shaped sign should be used
No Passing Zone
Denoted by the acronym ESAL, a metric used to normalize vehicle volumes for purposes of pavement design
Equivalent Single-Axle load
This naturalistic driving research program (acronym) recorded over 5.4 million trips and 36,000 significant events
SHRP2 (Strategic Highway Research Program #2)
The unused portion of a signal cycle, which can occur at the beginning or end of a cycle
Lost time
The AASHTO standard driver eye height for passenger cars
3.5 feet
The Beatles sing “Come Together”, or where drivers do so at a freeway entrance, you might find this sign
Merge Sign
A factor of 1.5 for single unit trucks, 2.5 for buses, and 0.5 for motorcycles, this is used to convert traffic into a homogenous flow for traffic volume estimates
Passenger car unit equivalent
Safety Performance Functions help to overcome this statistical bias
Regression to the Mean
An evaluation by an independent third-party to identify safety performance improvements
RSA (Road Safety Audit)
Typical pedestrian walking speed as recommended by the MUTCD
3.5 ft/sec
This sign name describing an angry male deer is used to warn drivers of an at-grade railroad crossing
The daily threshold volume at which a road is considered low-volume according to the MUTCD
400 AADT
This is the most complex sub-task of driving
Navigation
The average speed of all vehicles traveling a given segment of roadway during a specified period of time, which is defined as the total distance traveled over total travel time for all vehicles
Space-Mean Speed (SMS)
Multiply a speed by this number to convert miles/hour to feet/second
1.47