Lok Sabha Question No. 4594 (UNSTARRED), answered on 2026-03-19
Subject: New National Highway Connecting Sikkim to Siliguri
Ministry: ROAD TRANSPORT AND HIGHWAYS
Asked by: Dr. Indra Hang Subba

## GOVERNMENT OF INDIA MINISTRY OF ROAD TRANSPORT AND HIGHWAYS

## LOK SABHA UNSTARRED QUESTION NO. 4594 ANSWERED ON 19 TH  MARCH, 2026

## NEW NATIONAL HIGHWAY CONNECTING SIKKIM TO SILIGURI

4594.  DR. INDRA HANG SUBBA:

Will the Minister of ROAD TRANSPORT AND HIGHWAYS

सड़क परिवहन औि िाजमार्ग मंत्री

be pleased to state:

- (a) whether the Government has appointed any agency to survey and design a new highway connecting Sikkim with Siliguri, if so, the details thereof;
- (b)  the  details  regarding  the  construction  status  of  National  Highway  (NH) 510 undertaken by National Highways & Infrastructure Development Corporation Limited (NHIDCL) in the State of Sikkim; and
- (c) whether the Government is considering any new National Highways (NHs) in the State of Sikkim, if so, the details thereof?

## ANSWER

## THE MINISTER OF ROAD TRANSPORT AND HIGHWAYS (SHRI NITIN JAIRAM GADKARI)

- (a)  The  Government  through  its  implementing  agency  National  Highway Infrastructure  Development  Corporation  (NHIDCL)  has  engaged  a  Project Management  Consultancy  (PMC)  firm  on  22.08.2025  for  preparation  of Detailed Project Report (DPR) as well as construction supervision for taking up  widening  to  2-lane  with  paved  shoulder  along  with  specialized  slope protection works in vulnerable landslide / sinking zones in 52 km length of Sevoke-Rangpo Section of National Highway No. 10 in the states of Assam
- and West Bengal.
- (b)  National  Highway  (NH)  510  originates  from  Singtam  and  terminates  at Gyalshing, covering a length of approximately 90 km. The development of the existing single-lane road to 2-lane with paved shoulder standards has been taken  up in  06  contract  packages  of  which,  02  contract  packages  i.e

Singtam-Tarku  and  Tarku-Rabongla  covering  about  32.5  km  have  largely been completed, except a small stretch of 3 km near Singtam affected due to the glacial lake outburst flood in 2023 and local Land Acquisition (LA)  issues, for which DPR preparation is underway. The Package-wise details of completed (2 nos.) and ongoing (04 nos.)  projects of NH-510 are given in Annexure. (c)  The  declaration  of  roads  as  National  Highways is a continuous process and  is  done  from  time  to  time  depending  on  requirement  of  connectivity, traffic  density,  economic importance, strategic needs and synergy with PM

Gati Shakti National Master Plan.

ANNEXURE  REFERRED  TO  IN REPLY TO PART (b) OF  LOK  SABHA UNSTARRED QUESTION NO. 4594 ANSWERED ON 19 TH  MARCH, 2026 ASKED BY  DR.  INDRA  HANG  SUBBA  REGARDING  'NEW  NATIONAL  HIGHWAY CONNECTING SIKKIM TO SILIGURI'.

## I: Completed Project of NH-510

|   S. No. | Nameofwork                                                                                                                                                                                                                            | Length (km)/ Cost (Rs in Cr)   | Date of Start/ Scheduled Date of Completion   | Actual Date of Completion                                                                                                                                                                                                                           |
|----------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------|-----------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|        1 | Construction of 2 lane with paved Shoulder including Geometric Improvement from Km. 000 to Km. 16.000 of Stretch Singtam-Tarku of NH- 510 on EPC Basis under SARD-NE Phase-A in the State of Sikkim                                   | 16.0 km / 375.80 Cr.           | 05.10.2019 / 05.04.2022                       | Part Completion Certificate issued for the section km 3.0 to km 16.00 on 29.11.2023. Due to Glacial Lake Outburst Flood (GLOF) in 2023 & local issues between section km 0.00 to 3.0, NHIDCL engaged DPR Consultant for the preparation of the DPR. |
|        2 | Construction and up- gradation of existing road to 2 - lane with paved shoulder including geometric improvement of NH-510 fromkm 16.000 to km 32.500 (Tarku - Rabongla) on EPC basic under SARDP-NE Phase 'A' in the state of Sikkim. | 16.5 km / 290.5 Cr.            | 01.11.2017 / 31.10.2020                       | 30.04.2024                                                                                                                                                                                                                                          |

## II: Ongoing Project of NH-510

|   S. No . | Nameof work                                                                                                                                                                                                                                                                                     | Length (km )/ Cost (Rs in Cr)   | Date of Start / Likely Date of Completion   | Physica l Progre ss (%)   | Financi al Prog ress (%)   | Rema rks                |
|-----------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------|---------------------------------------------|---------------------------|----------------------------|-------------------------|
|         1 | Construction of 2-lane specification road with paved shoulder includi ng Tunnel (300m) at Ra bangla (Singtam - Tark u - Rabangla- Legship - Gyalshing) Package-III (Design Ch.: 32.500 km to 33.600 km) under S ARDP-NE (Package- III)                                                          | 1.10 km / 79.21 Cr              | 15.10.2020 / 26.03.2024                     | 100%                      | 98.43 %                    | Physi cally Compl eted  |
|         2 | Rehabilitation &Upgra dation of existing road to 2-lane with paved s houlder including geo metric improvement of section from start of R abonglakm 33.600 to km 58.840 (Package- I V).                                                                                                          | 25.24 km / 292.80 Cr            | 31.10.2020 / 30.06.2026                     | 64.30 %                   | 61.36 %                    | Under imple menta tion. |
|         3 | Construction of 2-lane Specification Road wit h Paved Shoulder as R e-alignment (Greenfiel d Alignment) of Existin g Stretch between Leg ship to Gyalshing of N H-510 (Design Chainag e from Km 58.840 to K m75.00) under SARDP- NE Phase 'A' on EPC Mode in the State of Si kkim- (Package-V). | 16.16 km / 414.20 Cr            | 10.11.2020 / N A                            | 49.20 %                   | 45.95 %                    | Under termin ation.     |

| 4. Construction of 2-Lane Specification Road wit h Paved Shoulder as R e- alignment (Greenfiel d Alignment) of Existin g Stretch between Leg ship to Gyalshing of NH -510 (Design Chainage from Km 75.000 to Km90.210) under SARDP-NE Pha se 'A' on EPC Mode i   | 15.21 km / 439.56 Cr   | 10.05.2022 / N A   | 51.85 %   | 48.33 %   | Termi nated. New c ontrac tor to be app ointed.   |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------|--------------------|-----------|-----------|---------------------------------------------------|

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