| Primary value | 6.0 m |
| Applies to | Two-way basement parking ramps · Combined up/down parking ramps |
| Exceptions | One-way ramp → 3.0 m |
| Measured as | Clear width between kerbs / wall faces. |
| Source | NBC 2016 — Part 3, Clause 8 ✓ Verified |
Two-way ramps save plot area by combining up and down traffic into one ramp. 6.0 m is the minimum that lets two cars pass on the slope without one yielding.
Used when site constraints don't allow separate up and down ramps. Always paired with strict one-way signage at the top and bottom approaches to prevent collisions on the slope.