MTO Roadway Design & Engineering 3 — Questions and Answers
Question 1: In traffic engineering, what does 'LOS' stand for?
- Level of Signalization
- Length of Segment
- Level of Service (Correct answer)
- Lane Operational Speed
Correct answer: Level of Service
LOS (Level of Service) is a qualitative measure describing traffic flow conditions, ranging from A (free flow) to F (forced/breakdown flow).
Question 2: What is the minimum recommended sight distance at a railroad grade crossing called?
- Decision sight distance
- Stopping sight distance
- Crossing sight distance (Correct answer)
- Advance sight distance
Correct answer: Crossing sight distance
Crossing sight distance (also called highway-rail grade crossing sight distance) is the minimum distance a driver must be able to see approaching trains.
Question 3: A 'crest vertical curve' is used when:
- The road profile forms a valley
- The road profile forms a hill or high point (Correct answer)
- Two roads merge at grade
- The road transitions from rural to urban
Correct answer: The road profile forms a hill or high point
A crest vertical curve connects an ascending grade to a descending grade, forming a summit or high point in the road profile.
Question 4: Which of the following best describes 'context-sensitive design' in roadway engineering?
- Designing roads to meet only maximum traffic volume
- Balancing roadway function with community values and environmental context (Correct answer)
- Using standardized templates regardless of local conditions
- Prioritizing vehicle speed over all other factors
Correct answer: Balancing roadway function with community values and environmental context
Context-sensitive design balances transportation function with the surrounding community, environmental, and aesthetic context to develop appropriate roadway solutions.
Question 5: What is the purpose of a 'taper' in a lane drop or merge area?
- To increase the speed limit before a lane ends
- To gradually transition vehicles from one lane to another over a distance (Correct answer)
- To mark pedestrian crossings
- To delineate bicycle lanes
Correct answer: To gradually transition vehicles from one lane to another over a distance
A taper provides a gradual transition zone that allows drivers to merge or diverge smoothly and safely over an appropriate distance.
Question 6: In roadway cross-section design, 'normal crown' refers to:
- The peak of a crest curve
- The standard two-sided cross slope on a tangent section (Correct answer)
- The height of a raised median
- The maximum allowable superelevation
Correct answer: The standard two-sided cross slope on a tangent section
Normal crown is the standard cross-sectional shape with slopes falling away from the centerline on both sides to drain water off the roadway.
Question 7: What is a 'frontage road' primarily designed to do?
- Provide emergency vehicle access to highways
- Provide local access while separating local traffic from limited-access highway traffic (Correct answer)
- Connect two parallel highways
- Serve exclusively as a bicycle and pedestrian facility
Correct answer: Provide local access while separating local traffic from limited-access highway traffic
Frontage roads (service roads) run parallel to a limited-access highway, providing local property access while keeping that traffic off the main roadway.
MTO Roadway Design & Engineering 3
In traffic engineering, what does 'LOS' stand for?