Built environment variables ranked for study
| Number | Variable |
| 1. | Schools |
| 2. | Health centres/hospitals |
| 3. | Markets/trading centres |
| 4. | Retail shops |
| 5. | Taxi parks |
| 6. | Fuel stations |
| 7. | Bars/night clubs |
| 8. | Commercial areas with arcades and plazas |
| 9. | Worship places such as churches and mosques |
| 10. | Industries/factories |
| 11. | Residential land use |
| 12. | Population density of an area |
| 13. | Socio-economic status of an area |
| 14. | Highways |
| 15. | Arterial/major roads |
| 16. | Local/minor roads |
| 17. | By-passes |
| 18. | Fly-overs |
| 19. | Junctions/intersections |
| 20. | Roundabouts |
| 21. | Traffic lights at intersections |
| 22. | Speed calming measures, for example, humps |
| 23. | Bends |
| 24. | Number of lanes |
| 25. | Width of roads |
| 26. | Vehicular traffic |
| 27. | Pedestrian volumes |