Transport in Bihar
This article deals with the system of transport in Bihar, both public and private.
Road transport
Bihar has national highways with total length of and state highways with total length of. Also. Bihar has of proposed Expressways.The state is being equipped with more sustainable energy sources, CNG filling stations are being put up in different cities.
To manage overall road transport facilities in the state, Bihar State [Road Transport Corporation] was set up in 1959 under the provisions of Road Transport Corporation Act, 1950.
BSRTC operates and maintains a fleet of more than 300 buses connecting all cities and towns within state of Bihar and neighboring states too. BSRTC not only connects every nook and corner of the state but also links this state with other surrounding regions including Uttar Pradesh, Jharkhand, Chhattisgarh, West Bengal and Odisha. However, contract for operation and maintenance of the buses has been given to two private companies viz. GIPL and Royal Cruiser. This contract is based upon public-private partnership
Expressways
Expressways in Bihar are as follows:Within Patna city
These are intra-city short expressways.| Name | States | Total Length | Length Bihar | Cost | Type | Status | Direction | Comment |
| Outer Ring Road, Patna | Bihar | Greenfield | Under-construction | E to W | ||||
| Loknayak Ganga Path, Patna | Bihar | 3,160 | Greenfield | Under-construction phase 2 | E to W | Riverfront project within Patna. |
West-East
Within West-East direction listed from north to south:| Name | States | Total Length | Length Bihar | Cost | Type | Status | Direction | Comment |
| Gorakhpur-Siliguri Expressway | Uttar Pradesh, Bihar, West Bengal | 32,000 | Greenfield | Under- Survey | W to E | |||
| Buxar-Bhagalpur Expressway | Bihar | Mixed | Under- Survey | W to E | From UP border to WB border through central Bihar along Ganga river. Buxar-Bhagalpur Expressway includes Buxar-Patna Expressway and Munger-Mirzachowki Expressway (125 km, under-construction, completion 2028, Rs 8000 crore. |
Northwest-Southeast
Within Northwest-Southeast direction listed from north to south:| Name | States | Total Length | Length Bihar | Cost | Type | Status | Direction | Comment |
| Varanasi–Ranchi–Kolkata Expressway | Uttar Pradesh, Bihar, Jharkhand, West Bengal | 24,275 | Greenfield | Under-construction | NW to SW | Via South West Bihar to Kolkatta. | ||
| Bettiah-Patna Expressway | Bihar | 6,500 | Greenfield | Under-construction | NW to SW | Target completion 2028. | ||
| Dumaria Ghat-Bakarpur Expressway | Bihar | 1,543 | Greenfield | Under-construction | NW to Central SW | Connects to Gorakhpur via NH-27 & NH-28, target completion 2028. | ||
| Patna-Kolkata Expressway | Bihar, Jharkhand, West Bengal | Greenfield | DPR | NW to SW | To be taken up in Bharatmala-II. | |||
| Raxaul-Haldia Expressway | Bihar, Jharkhand, West Bengal | 54,000 | Greenfield | DPR | NW to SW | Under-construction, target completion 2028, via Samastipur. |
Northeast-Southwest
| Name | States | Total Length | Length Bihar | Cost | Type | Status | Direction | Comment |
| Darbhanga-Aurangabad Expressway | Bihar | 8,000 | Greenfield | Under-construction | Central NE to SW | Central Bihar to South West Bihar. Target completion 2028. | ||
| Sasaram-Patna Expressway | Bihar | 4,000 | Greenfield | Under-construction | NE to SW | Target completion 2028, Sasaram in northeast to Ara and Patna in southwest. | ||
| Patna-Purnia Expressway | Bihar | 8,000 | Greenfield | Under-construction | NE to SW | Target completion 2028: Patna in northeast to Purnia in southwest. |
Rail transport
Urban Rail
- Patna Metro - Under construction
- Patna Monorail - Proposed
- Patna tram - defunct since 1903
Water transport
[Image:National Inland waterways 1.png|left|180px|thumb|Map showing national inland waterway-1 and various river ports or terminals along its stretch.]Image:Patna river port1.JPG|right|180px|thumb|Patna river port on national inland waterway-1 at Gai Ghat
Bihar is connected by National Waterway No. 1 which was established in October 1986. This waterway has fixed terminals at Haldia, BISN, Pakur, Farrakka and Patna. It also has floating terminals facilities at Haldia, Kolkata, Diamond Harbour, Katwa, Tribeni, Baharampur, Jangipur, Bhagalpur, Semaria, Doriganj, Ballia, Ghazipur, Varanasi, Chunar and Allahabad.
Air transport
Patna airport is well connected to cities like Delhi, Mumbai, Kolkata, Bengaluru and many other cities in India. It is categorized as a restricted international airport, with customs facilities to receive international chartered flights. Gaya Airport, is Bihar's only international airport and offers seasonal flights that connect the city to Thailand, Bhutan, and Myanmar. Airlines like IndiGo, SpiceJet and Air India connect various airports in Bihar to cities across India. Darbhanga Airport is another domestic airport in Bihar which is connected with various cities across India. The Darbhanga Airport was built as civil enclave.| City served | Airport name | ICAO | IATA | Category | Role |
| Bihta | Bihta Air Force Station | — | — | Defence | Air base |
| Bhagalpur | Bhagalpur Airport | — | — | Domestic | |
| Darbhanga | Darbhanga Airport | VE89 | DBR | Domestic | Civil enclave |
| Gaya | Gaya Airport | VEGY | GAY | Customs | Commercial |
| Jogbani | Jogbani Airport | — | — | Domestic | Closed |
| Munger | Munger Airport | — | — | Domestic | No scheduled flights |
| Muzaffarpur | Muzaffarpur Airport | VEMZ | MZU | Domestic | No scheduled flights |
| Patna | Jay Prakash Narayan Airport | VEPT | PAT | Customs | Commercial |
| Purnea | Purnea Airport | VEPU | PXN | Domestic | Civil enclave |
| Raxaul | Raxaul Airport | VERL | — | Domestic | Closed |
- The airport usually serves domestic flights only, but the city being a pilgrimage city, the airport operates seasonal flights to international destinations.
- The airport is classified as a restricted international airport due to its short runway and serves only domestic flights.