--- title: "Principle and complexities of route location" subject: "Transportation Engineering I" chapter: 2 key: "semester_6/transportation_engineering_i:location-principle-complexities" source: https://www.bctengineer.com/q/semester_6/transportation_engineering_i/location-principle-complexities site: BCT Engineering --- # Principle and complexities of route location Transportation Engineering I · Chapter 2: Highway Alignment and Engineering Survey - Asked in: 2076 Baisakh, 8 marks - Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14 - Page: https://www.bctengineer.com/q/semester_6/transportation_engineering_i/location-principle-complexities - Whole chapter: https://www.bctengineer.com/md/semester_6/transportation_engineering_i/chapter-2 ## Question State the basic principle for locating highways and describe the complexities associated with the route location process. ## Short answer The basic principle is to minimize total cost (construction, maintenance, vehicle operation, accidents) over the road's life while meeting traffic, safety, and environmental needs. Complexities include conflicting objectives, numerous variables (terrain, geology, land use), uncertain data, obligatory points, hard-to-value environmental/social costs, land acquisition issues, environmental restrictions, geological risks, infrastructure interactions, and time/funding constraints. ## Answer #### Basic principle of route location The aim is to find the route which gives the **minimum total cost** to the nation - the sum of construction cost, maintenance cost, vehicle operating cost (including time cost) and accident cost over the life of the road - while serving the traffic and meeting the safety and environmental requirements. In short, the route should be **short, easy, safe and economical**, passing through the obligatory points and avoiding the points to be avoided. The route is located in a systematic sequence: region -> band -> corridor -> alignment, using map study, reconnaissance, preliminary and detailed surveys. #### Complexities of route location 1. **Many conflicting objectives:** the shortest route may be steep or costly; the cheapest may be long or unsafe, so a compromise is needed. 2. **Large number of variables:** terrain, geology, hydrology, land use, traffic, environment all affect the choice. 3. **Uncertain and incomplete data:** maps may be old and field data limited; future traffic is only a forecast. 4. **Obligatory points** may be far from each other or impose very difficult geometry (e.g. a pass). 5. **Cost and benefit that cannot be easily valued:** environmental harm, social impact, resettlement, loss of heritage. 6. **Land acquisition and public opposition,** political pressure and administrative boundaries. 7. **Environmental restrictions** (national parks, forests, wetlands, EIA). 8. **Hydrological and geological risks** in Nepal: floods, landslides, young unstable hills. 9. **Interaction with other infrastructure** (canals, power lines, existing roads). 10. **Time and funding limits** and need for staged construction. Therefore, the location team should compare alternatives using a multi-criteria or economic analysis, and select the route that gives the best overall result. ## Check yourself The answer's key points as multiple-choice questions, with the correct option and why. 1. What is the basic principle of route location? A. Choose the shortest route always B. Choose the route giving minimum total cost (construction, maintenance, vehicle operation, accident) over road life C. Choose the cheapest construction cost D. Choose the route with least land Answer: B. The aim is minimum total cost to the nation while meeting safety and environmental needs. (Key point: Basic principle) 2. Why is route location complex because of conflicting objectives? A. All objectives agree B. Only one variable matters C. The shortest route may be steep or costly, so a compromise is needed D. Cost is never a factor Answer: C. The shortest, cheapest and safest routes often differ, so trade-offs are needed. (Key point: Conflicting objectives) 3. Which is a complexity caused by data? A. Maps are old, field data limited and future traffic only forecast B. All data are exact C. Traffic is certain D. No data are needed Answer: A. Uncertain and incomplete data make the decision harder. (Key point: Uncertain data) 4. Which cost or benefit is hard to value in route location? A. Length of road B. Number of culverts C. Pavement thickness D. Environmental harm, resettlement and loss of heritage Answer: D. Environmental and social impacts cannot easily be given a money value. (Key point: Hard-to-value effects) ## Related in Transportation Engineering I - [Structure of route location process](https://www.bctengineer.com/question.md?key=semester_6%2Ftransportation_engineering_i%3Astructure-route-location) — Transportation Engineering I, chapter 2, asked 5× - [River route location considerations](https://www.bctengineer.com/question.md?key=semester_6%2Ftransportation_engineering_i%3Ariver-route-considerations) — Transportation Engineering I, chapter 5, asked 2× - [Route location in hill road design](https://www.bctengineer.com/question.md?key=semester_6%2Ftransportation_engineering_i%3Ahill-route-location) — Transportation Engineering I, chapter 5 - [Final location and detailed survey](https://www.bctengineer.com/question.md?key=semester_6%2Ftransportation_engineering_i%3Adetailed-survey) — Transportation Engineering I, chapter 2, asked 3× ## Related in other subjects - [Locating principle and design of a drill jig](https://www.bctengineer.com/question.md?key=semester_2%2Fworkshop_technology%3Ajig-locating-principle-design) — Workshop Technology, chapter 12 - [Locating substation and floor distribution board](https://www.bctengineer.com/question.md?key=semester_6%2Findustrial_power_distribution_and_illumination%3Alocate-substation-floor-db) — Industrial Power Distribution and Illumination, chapter 4