Questions and Answers
What does the letter 'S' indicate in the vehicle types outlined?
What is the maximum permissible width of a vehicle according to the outlined standards?
What is the maximum length allowed for a truck-tractor semi-trailer combination, exclusive of bumpers?
What does the maximum permissible gross weight include?
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What is considered when selecting the vehicle type for road design?
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Which vehicle type does not need to be considered for design in steep and mountainous terrain?
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What is the tandem axle weight limit for a vehicle as outlined in the standards?
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What does 'Gross Weight' refer to in vehicle design?
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Which dimension is included in the overall length of a vehicle?
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What is excluded from the overall width measurement of a vehicle?
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Study Notes
Scope of Road Design Vehicles
- Standard applies to all road elements excluding culverts and bridges, which follow IRC Bridge Codes.
- Recognizes three types of commercial vehicles: single unit, semi-trailer, and truck-trailer combination.
- Vehicle type selection for road design depends on factors like terrain, economic justification, and road importance.
- Roads in steep or mountainous areas typically designed only for single unit vehicles.
Definitions
- Axle: A rod or shaft that rotates wheels and supports vehicle weight.
- Gross Weight: Total weight of a vehicle or combination, including the vehicle's load.
- Length Overall: Total longitudinal dimension of a vehicle or combination with any load.
- Height Overall: Vertical dimension from ground level to top of vehicle or load.
- Width Overall: Total transverse dimension including vehicle loads, excluding safety devices and tire bulging.
Vehicle Types
- Vehicle types outlined by a code indicating number of axles and configuration.
- Use of letters 'S' denotes semi-trailer, with subsequent digits indicating semi-trailer axle count.
- Examples:
- 2-S2: Two-axle truck-tractor with tandem-axle semi-trailer.
- 2-2: Two-axle truck with a two-axle trailer.
Dimensional Restrictions
- Maximum vehicle width is 2.5 meters.
- Length for single unit trucks/buses with two or more axles is 11-12 meters.
- Truck-tractor semi-trailer combination length is limited to 16 meters (excluding bumpers).
- Truck-trailer combination length is limited to 18 meters (excluding bumpers).
Weight Regulations
-
Single Axle Weight:
- Single axle: up to 10.2 tons.
- Single wheels: 6 tons.
- Dual wheels: 10.2 tons.
-
Tandem Axle Weight:
- Two-axle units: up to 18 tons.
Maximum Permissible Gross Weight
- Refers to the total allowable weight of a vehicle, including driver and load, distributed across all wheels at any given time.
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Description
This quiz focuses on the dimensions and weight of road design vehicles as defined in the associated standards. It covers various types of commercial vehicles and their application in designing road elements. Useful for students and professionals in civil engineering and transportation planning.
