文档介绍：speed,travel time and delay studies.
Spot speed study
Data collection method
Data calculation and analysis
Travel time and delay studies
Concepts and definitions for travel time and delay data
Methods for obtaining travel time or delay data
Intersection delay studies
Methods for measurement of intersection delay
Field data collection
Observer assignment for the field studies
Spot speed study
——Establish roadway design elements
——Determine existing roadway speed
——Assess impact on speed of traffic control devices
——Evaluate the effectiveness of speed enforcementprograms
——Provide evidence to plaints of excessive speed
Data collection method
Two methods are discussed:
First , Stopwatch method:
Organize study plan and preparation,
Selcet proper location and layout,
Calculation and analysis
Second, Radar meter anize study plan and preparation,
Ddtermine an appropriate selection strategy,
Record observations on radar meter spot speed data form,
Calculation and analysis
Data calculation and analysis
Calculation
time and delay studies
Need space speed
Use travel time to determine space speed
Servey of delay
and definitions for travel time and delay data
Travel time study
Delay study
Travel time
Travel speed
Running time
Running speed
Stopped time
Rate of motion
Delay
for obtaining travel time or delay data
The license plate methods
The floating car method
The photographic technique
The interview technique