Lawson 2001 - Comfort & Safety Criteria
The Lawson 2001 criteria introduced two major changes compared to Lawson 1978:
- The comfort categories (A–E) use a 5% exceedance probability instead of 2%.
- Two explicit safety categories (S) were added, addressing strong winds hazardous to pedestrians.
These updates made the standard both more practical for assessing everyday comfort and more rigorous for pedestrian safety.
Lawson 2001 Comfort Categories
| Category | Wind Speed Threshold | Exceedance Probability | Typical Activity | Color |
|---|---|---|---|---|
| A | ≤ 4 m/s | ≤ 5% | Sitting (outdoor cafés, benches) | |
| B | ≤ 6 m/s | ≤ 5% | Standing / short exposure | |
| C | ≤ 8 m/s | ≤ 5% | Strolling / casual walking | <div style=“background-color:#FFFF00; width:20px; height: |