India's connectivity projects link its cities and its neighbours by road.
This page covers the Golden Quadrilateral, the two other corridors, the Trilateral Highway, its Myanmar sections and why it is delayed.
- Golden Quadrilateral: 5,846 km, built by NHAI.
- East-West Corridor: Silchar to Porbandar.
- North-South Corridor: Srinagar to Kanyakumari.
- Trilateral Highway: Moreh to Mae Sot, 1,360 km.
- Delay: Myanmar unrest and a pending Motor Vehicles Agreement.
Contents
1. What is the Golden Quadrilateral?
The Golden Quadrilateral, or GQ, is a network of highways joining Delhi, Mumbai, Chennai and Kolkata. Its length is 5,846 km. The National Highways Authority of India, or NHAI, builds it. It is one part of a bigger plan called the National Highways Development Project.
1.1 Why is it called a “quadrilateral”?
Join the four metro cities on a map and you get a rough four-sided loop. That shape gives the project its name. The route on the map is only approximate.
1.2 How far had the work come in 2003?
In April 2003, work was done on 1,327 km of the 5,846 km. By July 2003, 1,408 km was already four-laned. Another 4,354 km was under work, and 84 km was still waiting to be awarded.

2. What are the two other corridors?
Two more corridors sit beside the GQ. The East-West Corridor links Silchar in Assam with Porbandar in Gujarat. The North-South Corridor links Srinagar in Jammu and Kashmir with Kanyakumari in Tamil Nadu. All three together make up the National Highways Development Project.
2.1 How long are these two corridors?
A 2003 release called the North-South Corridor 4,076 km long. The two corridors together were first approved at 7,300 km. The actual length was 7,274 km, without counting 442 km that the two share.
2.2 Why do exams mix up the end cities?
Each corridor is named by its two end points. Exam writers swap in a famous city nearby. Dibrugarh and Surat are the common wrong answers for the East-West Corridor. The true ends are Silchar and Porbandar.
3. What is the India-Myanmar-Thailand Trilateral Highway?
This highway is a joint plan of India, Myanmar and Thailand. It is 1,360 km long. It starts at Moreh in Manipur and ends at Mae Sot in Thailand. It crosses Myanmar on the way.
3.1 Why is it not a domestic highway?
The GQ and the two corridors lie fully inside India. The Trilateral Highway crosses borders. So it needs treaties and shared plans with two other countries. That makes it a foreign policy project as much as a road project.
3.2 What was the plan back in 2003?
In March 2003, a release spoke of a highway from Moreh in India to Mae Sot in Thailand through Bagan in Myanmar. The idea is old. Work on the ground began many years later.
Think it through: why is the Trilateral Highway a foreign policy project?
It crosses the borders of three countries. So it needs treaties and shared plans, not only road building.
4. Which parts of the highway does India build?
India builds two sections inside Myanmar. One is the 120.74 km Kalewa-Yagyi road. The other is 69 bridges, with approach roads, on the 149.70 km Tamu-Kyigone-Kalewa road, or TKK. India pays for both as grant help to Myanmar.
4.1 What did the two sections cost?
The approved cost was Rs 1,459.29 crore for Kalewa-Yagyi. It was Rs 371.58 crore for the 69 bridges. By January 2019, India had released Rs 188.32 crore and Rs 4.84 crore of these sums.
4.2 What was the work schedule?
The bridges work was awarded in November 2017. The Kalewa-Yagyi work was awarded in May 2018. Both were given on a design-and-build basis called EPC. Each was meant to finish within three years of starting.
5. Why has the Trilateral Highway been delayed?
There are two clear reasons. The first is unrest in Myanmar. External Affairs Minister S Jaishankar said that the situation in Myanmar had paused the project. He said practical ways must be found to move it ahead. The second is a missing traffic pact.
5.1 What is the Motor Vehicles Agreement?
Vehicles cannot cross three borders freely without a pact. In 2019, a Motor Vehicles Agreement for the three countries was still under talks between governments. A road with no such pact cannot carry through traffic.
5.2 How much was built before the pause?
Press reports say at least 70 per cent of the construction was done by July 2023. The same reports call the highway about 1,400 km long. PIB gives the length as 1,360 km, so use the PIB figure for exams.
Think it through: why can a built road still not carry through traffic?
Vehicles need a pact to cross borders. The Motor Vehicles Agreement for the three countries was still under talks in 2019.
6. How do UPSC questions use these projects?
UPSC Civil Services Prelims 2023 (GS Paper I, Q10) gave three statements on connectivity projects. All three were wrong. The East-West Corridor does not join Dibrugarh and Surat. The Trilateral Highway does not end at Chiang Mai. The BCIM Economic Corridor does not join Kolkata with Varanasi.
## Dropped from the live article (sourced-only shrink)
- “completed in 2012” for the GQ: no PIB or press source read. Removed.
- Mandalay and Naypyidaw as route points: PIB 2003 says Bagan. Removed.
- BCIM route specifics (Kolkata-Kunming via Dhaka and Mandalay): not stated by an Indian press or PIB source read. Kept only inside the PYQ section, where the UPSC paper names BCIM.
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