Table 3

Road traffic speed for intervention streets over time

Time of day8.00–9.0012.00–13.0017.00–18.0021.00–22.00Overall*
Time periodPre1 year3 yearsPre1 year3 yearsPre1 year3 yearsPre1 year3 yearsPre1 year3 years
Chichester Street20.020.2 (0.2)19.9 (−0.1)17.018.0 (1.0)16.8 (−0.2)14.115.8 (1.7)15.1 (1.0)23.121.5 (−1.6)21.3 (−1.8)19.218.9 (−0.3)17.7 (−1.5)
Donegall Place14.617.1 (2.5)16.2 (1.6)11.614.2 (2.6)13.8 (2.2)11.113.7 (2.6)13.6 (2.5)15.317.8 (2.5)18.3 (3.0)14.216.5 (2.4)16.5 (2.3)
Donegall Street21.524.2 (2.7)24.2 (2.7)19.120.1 (1.0)20.2 (1.1)19.419.5 (0.1)20.5 (1.1)20.321.1 (0.8)21.0 (0.7)20.220.9 (0.7)21.0 (0.8)
High Street16.220.0 (3.8)20.6 (4.4)10.217.3 (7.1)17.3 (7.1)14.316.9 (2.6)16.6 (2.3)17.618.5 (0.9)19.3 (1.7)14.417.9 (3.5)17.8 (3.3)
Howard Street17.019.0 (2.0)20.7 (3.7)19.916.9 (−3.0)18.6 (−1.3)14.714.2 (−0.5)14.2 (−0.5)18.617.9 (−0.7)20.3 (1.7)17.217.4 (0.2)18.9 (1.7)
May Street17.720.8 (3.1)18.6 (0.9)17.419.6 (2.2)16.5 (−0.9)15.616.3 (0.7)13.7 (−1.9)25.723.4 (−2.3)20.6 (−5.1)19.920.1 (0.2)17.4 (−2.6)
North Street20.4 19.7 (−0.7)15.817.6 (1.8)16.617.7 (1.1)22.719.8 (−2.9)18.718.5 (−0.2)
Queen Street18.016.0 (−2.0)20.2 (2.2)17.114.5 (−2.6)16.6 (−0.5)16.915.0 (−1.9)16.2 (−0.7)18.316.7 (−1.6)20.4 (2.1)17.515.1 (−2.3)18.0 (0.5)
Royal Avenue14.617.9 (3.3)16.0 (1.4)11.616.2 (4.6)15.3 (3.7)11.115.5 (4.4)15.1 (4.0)15.318.6 (3.3)16.2 (0.9)13.217.1 (4.0)15.6 (2.5)
Wellington Place16.216.5 (0.3)20.9 (4.7)15.014.8 (−0.2)19.1 (4.1)14.614.8 (0.2)18.5 (3.9)19.718.4 (−1.3)20.7 (1.0)16.916.4 (−0.4)19.9 (3.1)
York Street21.623.8 (2.2)20.8 (−0.8)21.121.8 (0.7)19.5 (−1.6)19.619.9 (0.3)18.7 (−0.9)24.423.3 (−1.1)21.3 (−3.1)21.821.8 (−0.0)19.8 (−2.0)
Overall*†18.220.0 (1.8)20.4 (2.1)17.117.9 (0.8)18.1 (1.0)15.816.5 (0.7)16.7 (0.9)20.720.1 (−0.6)20.5 (−0.3)18.218.6 (0.4)18.8 (0.6)
Overall (unweighted)†17.719.6 (1.8)19.8 (2.1)16.017.3 (1.3)17.4 (1.4)15.116.1 (1.0)16.2 (1.1)19.819.7 (−0.1)19.9 (0.1)18.919.4 (0.5)19.7 (0.8)
Median Difference2.3 (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 valueP=0.09P=0.01P=0.13P=0.08P=0.04P=0.03P=0.58P=0.97P=0.14P=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.