Road traffic speed for intervention streets over time
| Time of day | 8.00–9.00 | 12.00–13.00 | 17.00–18.00 | 21.00–22.00 | Overall* | ||||||||||
| Time period | Pre | 1 year | 3 years | Pre | 1 year | 3 years | Pre | 1 year | 3 years | Pre | 1 year | 3 years | Pre | 1 year | 3 years |
| Chichester Street | 20.0 | 20.2 (0.2) | 19.9 (−0.1) | 17.0 | 18.0 (1.0) | 16.8 (−0.2) | 14.1 | 15.8 (1.7) | 15.1 (1.0) | 23.1 | 21.5 (−1.6) | 21.3 (−1.8) | 19.2 | 18.9 (−0.3) | 17.7 (−1.5) |
| Donegall Place | 14.6 | 17.1 (2.5) | 16.2 (1.6) | 11.6 | 14.2 (2.6) | 13.8 (2.2) | 11.1 | 13.7 (2.6) | 13.6 (2.5) | 15.3 | 17.8 (2.5) | 18.3 (3.0) | 14.2 | 16.5 (2.4) | 16.5 (2.3) |
| Donegall Street | 21.5 | 24.2 (2.7) | 24.2 (2.7) | 19.1 | 20.1 (1.0) | 20.2 (1.1) | 19.4 | 19.5 (0.1) | 20.5 (1.1) | 20.3 | 21.1 (0.8) | 21.0 (0.7) | 20.2 | 20.9 (0.7) | 21.0 (0.8) |
| High Street | 16.2 | 20.0 (3.8) | 20.6 (4.4) | 10.2 | 17.3 (7.1) | 17.3 (7.1) | 14.3 | 16.9 (2.6) | 16.6 (2.3) | 17.6 | 18.5 (0.9) | 19.3 (1.7) | 14.4 | 17.9 (3.5) | 17.8 (3.3) |
| Howard Street | 17.0 | 19.0 (2.0) | 20.7 (3.7) | 19.9 | 16.9 (−3.0) | 18.6 (−1.3) | 14.7 | 14.2 (−0.5) | 14.2 (−0.5) | 18.6 | 17.9 (−0.7) | 20.3 (1.7) | 17.2 | 17.4 (0.2) | 18.9 (1.7) |
| May Street | 17.7 | 20.8 (3.1) | 18.6 (0.9) | 17.4 | 19.6 (2.2) | 16.5 (−0.9) | 15.6 | 16.3 (0.7) | 13.7 (−1.9) | 25.7 | 23.4 (−2.3) | 20.6 (−5.1) | 19.9 | 20.1 (0.2) | 17.4 (−2.6) |
| North Street | 20.4 | – | 19.7 (−0.7) | 15.8 | – | 17.6 (1.8) | 16.6 | – | 17.7 (1.1) | 22.7 | – | 19.8 (−2.9) | 18.7 | – | 18.5 (−0.2) |
| Queen Street | 18.0 | 16.0 (−2.0) | 20.2 (2.2) | 17.1 | 14.5 (−2.6) | 16.6 (−0.5) | 16.9 | 15.0 (−1.9) | 16.2 (−0.7) | 18.3 | 16.7 (−1.6) | 20.4 (2.1) | 17.5 | 15.1 (−2.3) | 18.0 (0.5) |
| Royal Avenue | 14.6 | 17.9 (3.3) | 16.0 (1.4) | 11.6 | 16.2 (4.6) | 15.3 (3.7) | 11.1 | 15.5 (4.4) | 15.1 (4.0) | 15.3 | 18.6 (3.3) | 16.2 (0.9) | 13.2 | 17.1 (4.0) | 15.6 (2.5) |
| Wellington Place | 16.2 | 16.5 (0.3) | 20.9 (4.7) | 15.0 | 14.8 (−0.2) | 19.1 (4.1) | 14.6 | 14.8 (0.2) | 18.5 (3.9) | 19.7 | 18.4 (−1.3) | 20.7 (1.0) | 16.9 | 16.4 (−0.4) | 19.9 (3.1) |
| York Street | 21.6 | 23.8 (2.2) | 20.8 (−0.8) | 21.1 | 21.8 (0.7) | 19.5 (−1.6) | 19.6 | 19.9 (0.3) | 18.7 (−0.9) | 24.4 | 23.3 (−1.1) | 21.3 (−3.1) | 21.8 | 21.8 (−0.0) | 19.8 (−2.0) |
| Overall*† | 18.2 | 20.0 (1.8) | 20.4 (2.1) | 17.1 | 17.9 (0.8) | 18.1 (1.0) | 15.8 | 16.5 (0.7) | 16.7 (0.9) | 20.7 | 20.1 (−0.6) | 20.5 (−0.3) | 18.2 | 18.6 (0.4) | 18.8 (0.6) |
| Overall (unweighted)† | 17.7 | 19.6 (1.8) | 19.8 (2.1) | 16.0 | 17.3 (1.3) | 17.4 (1.4) | 15.1 | 16.1 (1.0) | 16.2 (1.1) | 19.8 | 19.7 (−0.1) | 19.9 (0.1) | 18.9 | 19.4 (0.5) | 19.7 (0.8) |
| Median Difference | 2.3 (0.3 to 3.1) | 1.6 (−0.1 to 3.7) | 1.0 (−0.2 to 2.6) | 1.1 (−0.9 to 3.7) | 0.5 (0.1 to 2.6) | 1.1 (−0.7 to 2.5) | −0.9 (−1.6 to 0.9) | 0.9 (−2.9 to 1.7) | 0.2 (−0.3 to 2.4) | 0.8 (−1.5 to 2.5) | |||||
| P value | P=0.09 | P=0.01 | P=0.13 | P=0.08 | P=0.04 | P=0.03 | P=0.58 | P=0.97 | P=0.14 | P=0.17 | |||||
–, Missing data; (.) change in speed from pre-implementation.
*Overall speed is a weighted average using pre-study volume.
†Restricted to sites with data recorded at all time points.