| Primary value | 3.0 m |
| Applies to | Internal one-way driveways · Single-lane access roads to parking |
| Exceptions | Two-way driveway → 6.0 m |
| Measured as | Clear width between kerbs or wall faces — does not include the kerb itself. |
| Source | NBC 2016 — Part 3, Clause 8 ✓ Verified |
3.0 m is the smallest width that lets a typical Indian car (1.7-1.8 m wide) pass without scraping walls or kerbs, with a small safety margin for driver inattention.
Most apartment basement entries and exits use 3.0 m. Tight residential driveways sometimes squeeze to 2.7-2.8 m, but at the cost of damaged mirrors and walls.