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What is functional classification in highway development?
What is functional classification in highway development?
Functional classification groups highways by the character of service they provide.
What are the six stages in motor vehicle travel?
What are the six stages in motor vehicle travel?
Single-lane highways are considered appropriate for improved highway systems.
Single-lane highways are considered appropriate for improved highway systems.
False
What is the minimum number of traffic lanes recommended for any proposed highway?
What is the minimum number of traffic lanes recommended for any proposed highway?
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What is the standard carriageway width for 2-lane highways?
What is the standard carriageway width for 2-lane highways?
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What is the width range for climbing lanes on grades greater than 6%?
What is the width range for climbing lanes on grades greater than 6%?
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Adequate shoulders are essential on undivided highways.
Adequate shoulders are essential on undivided highways.
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What is the maximum recommended speed limit for undivided highways?
What is the maximum recommended speed limit for undivided highways?
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What is superelevation in highway design?
What is superelevation in highway design?
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What is a factor that affects the design of divided highways?
What is a factor that affects the design of divided highways?
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Study Notes
Highway Development and Planning
- Functional classification categorizes highways based on service character, focusing on motor vehicle travel and property access.
- Six stages of motor vehicle travel: main movement, transition, distribution, collection, access, and termination, each needing specific facility designs.
Traffic Volume and Design
- Traffic volume significantly influences highway design; primarily affects the number of lanes required.
- Modern standards prohibit single-lane and 3-lane highways in advanced systems.
- A minimum of 2 traffic lanes recommended, regardless of traffic volume.
2-Lane Highways
- Comprise the majority of highway length, available in various surface types, from gravel to high-quality pavement.
- Standard lane width ranges from 3.00 m to 3.65 m, ideally set at 3.35 m.
- Factors impacting design: traffic volume, design speed, terrain character, and economic considerations.
- Shoulders recommended at 3.00 m wide, though narrower widths may be acceptable in rugged terrain or for economic reasons.
Climbing Lanes in 2-Lane Highways
- Climbing lanes of 3.00 m to 3.35 m for grades exceeding 6% to assist heavy trucks on inclines.
- A climbing lane is necessary if truck traffic exceeds 20% of normal road usage; it should start at the base of the hill and extend beyond the crest to allow trucks to reach speed comfortably.
Undivided Highways (4 Lanes or More)
- Designed for one-way traffic in each lane, facilitating passing without opposing traffic interference.
- Speed limits generally set at 60 kph or less; emphasizes clear road marking to separate opposing lanes.
- Prominent shoulders encourage emergency use, crucial for safety in urban and suburban areas with heavy development.
Superelevation
- Superelevation counters centrifugal forces during curve navigation, designed to keep vehicles safely on track.
- Superelevation runoff manages water accumulation on curves, ensuring effective drainage and safe driving conditions.
Divided Highways
- Varied widths and pavement levels enhance design quality and cost efficiency.
- Climbing lanes on multilane roads may be necessary if uphill sections decrease capacity significantly.
- Medians influence superelevation runoff management, with options for uniform superelevation across the road or flat medians with rotating pavements.
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Description
This quiz focuses on Chapter 2 of Highway Development and Planning, which covers functional classification and the characteristics of different highway types. The chapter explores the stages of motor vehicle travel and its impact on adjacent properties. Test your understanding of these vital concepts in highway and railroad engineering.
