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Questions and Answers
What defines the Level of Service (LOS)?
What defines the Level of Service (LOS)?
- A measurement of vehicle emissions on roadways
- A quantitative measure of traffic speed
- A qualitative measure of operating conditions and driver perception (correct)
- A simulation of traffic flow under ideal conditions
Which Level of Service indicates congested flow?
Which Level of Service indicates congested flow?
- Level E
- Level A
- Level C
- Level F (correct)
Which factor is NOT considered in evaluating Level of Service?
Which factor is NOT considered in evaluating Level of Service?
- Traffic accident rates (correct)
- Traffic interruptions & restrictions
- Operating speed & travel time
- Driving comfort
Which Level of Service is characterized by little freedom to maneuver?
Which Level of Service is characterized by little freedom to maneuver?
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Which factor may affect the capacity and Level of Service on a roadway?
Which factor may affect the capacity and Level of Service on a roadway?
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What characterizes Level C in terms of driving conditions?
What characterizes Level C in terms of driving conditions?
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What is NOT a factor influencing the Level of Service?
What is NOT a factor influencing the Level of Service?
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What is the primary effect of roadway condition on Level of Service?
What is the primary effect of roadway condition on Level of Service?
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Study Notes
Level of Service (LOS)
- LOS is a measure of traffic stream conditions and driver/passenger perception.
Factors Considered in Evaluating LOS
- Operating speed and travel time
- Traffic interruptions and restrictions
- Freedom to maneuver
- Driving comfort
- Operating cost
Six Levels of Service
- Level A (Free-Flow): High physical and psychological comfort.
- Level B (Stable Flow): Reasonable level of physical and psychological comfort.
- Level C (More Restrictions): More restrictions than Level B, tension noticeable.
- Level D (Unstable Flow): Approaching unstable conditions, little freedom to maneuver.
- Level E (Unstable Flow): Maneuverability is extremely limited.
- Level F (Congested Flow): Road segment used above designed capacity.
Factors Affecting Capacity and Level of Service
- Roadway condition
- Lane width
- Laterals
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