BOT-Toll

BOT-Toll is a Public Private Partnership highway contract model in which the private concessionaire finances and builds the road, then collects toll fees directly from users for 20-30 years to recover its investment, bearing the traffic volume risk entirely without any government revenue guarantee.

What is BOT-Toll?

In BOT-Toll, the concessionaire's revenue depends entirely on actual traffic volumes, if fewer vehicles use the road than projected, revenue falls below projections and the concessionaire bears that loss. The government's obligation is only to maintain the concession right (no interference, no competing road) and to enforce toll collection rights. No annuity or government payment supplements the concessionaire's income.

BOT-Toll was India's first major PPP highway model. NHAI awarded hundreds of BOT-Toll concessions in the 2000s and early 2010s across national highways. Competitive bidding was based on the premium offered to NHAI (or the VGF, Viability Gap Funding, sought from NHAI) for the concession right. Projects with high traffic certainty attracted premium bids; weak-traffic corridors needed VGF.

The model declined after many concessionaires encountered traffic shortfalls, leading to debt defaults, NHAI arbitrations, and project restructurings. NHAI officially shifted preference to HAM in 2016, which eliminates traffic risk from the concessionaire. BOT-Toll continues for very high-traffic urban expressways and some greenfield corridors where traffic certainty is high.

Why BOT-Toll matters for Indian government suppliers

While NHAI's emphasis has shifted to HAM, state highway authorities and some central projects still use BOT-Toll for high-confidence corridors. Toll management companies (for toll collection and plaza operations), equipment suppliers (toll booths, electronic toll collection systems, CCTV, variable message signs), and road maintenance firms all supply to BOT-Toll concessionaires. Fastag-related IT systems for electronic toll collection (ETC) are a significant sub-market.

Example

NHAI awards a BOT-Toll concession for a 90-km 6-lane urban expressway near a major metro city. Traffic projections show 80,000 PCUs (passenger car units) per day based on land use studies. The winning bidder (an infrastructure company) offers NHAI a premium of Rs 50 crore for the concession, finances Rs 2,800 crore of construction, and collects toll for 25 years. Actual traffic in year 1 is 95,000 PCUs, above projection, making the concession highly profitable. The company earns healthy returns over the 25-year period and transfers the expressway to NHAI in maintained condition.

Frequently Asked Questions

What is VGF in a BOT-Toll highway project?

Viability Gap Funding (VGF) is a one-time government grant given to a BOT-Toll concessionaire where projected toll revenues are insufficient to make the project financially viable. NHAI or the relevant highway authority pays VGF during construction to reduce the concessionaire's equity requirement. The competitive bid parameter is the minimum VGF sought; the bidder seeking the lowest VGF wins.

What happened to the BOT-Toll concessions that defaulted?

Several BOT-Toll highways were restructured under a NHAI/lender settlement framework. Some were converted to EPC projects (government took back the concession and paid the concessionaire). Others were renegotiated with extended concession periods or toll rate revisions to restore financial viability. The Reserve Bank of India's stressed assets framework was applied to some bank-funded BOT-Toll loans.

Is Fastag relevant only to BOT-Toll highways?

FASTag is mandatory on all national and state highways with toll plazas in India, including EPC-built government-owned toll roads and BOT-Annuity roads with government-operated toll plazas. It is not specific to BOT-Toll. However, BOT-Toll concessionaires have particularly strong incentives to maximise FASTag adoption since accurate traffic counting affects their revenue directly.

How does a BOT-Toll contract end at concession expiry?

At the end of the concession period, the concessionaire hands over the highway, all toll plazas, equipment, and maintenance records to NHAI (or the relevant authority). The asset must be in a specified maintenance condition as assessed by an independent engineer. The concessionaire retains no residual rights; the government takes full operational control.