| Primary value | 3.0 / 5.5 m ((one-way / two-way)) |
| Applies to | All vehicular ramps to basements / podium / upper levels |
| Exceptions | One-way (single car at a time) → 3.0 m min |
| Two-way (two cars passing) → 5.5 m min | |
| Curved ramps (centreline radius ≥ 5.5 m) → Add 0.5 m to width | |
| Additional width for curved ramps → Increase width by 0.75 m | |
| Maximum slope (straight ramp) → 1 in 8 | |
| Maximum slope (curved ramp) → 1 in 12 | |
| Transition landings at top/bottom → 4.5 m long landing with max slope 1 in 20 (as per Clause 7.12.5.2) | |
| Measured as | Clear width of the ramp slab between curbs / walls. |
| Source | NBC 2016 — Part 3, Clause 7.12.5.1 ✓ Verified |
Insufficient ramp width can cause significant traffic bottlenecks at entry/exit points, especially during peak hours in commercial and high-density residential buildings. A compliant two-way ramp allows for simultaneous entry and exit, preventing queues from spilling onto public roads and ensuring smoother traffic flow within the premises.
While single-lane 3.0 m ramps are common for low-traffic residential buildings, most commercial and mixed-use projects opt for a two-way 6.0 m ramp. These are often physically divided by a median or marked with a centreline to guide drivers and improve safety.