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. 2007 Dec;13(6):388–393. doi: 10.1136/ip.2007.015701

Table 4 Potential bias: vehicle type.

Vehicle type All lanes* Percentage (95% CI) Closest lane† Percentage (95% CI)
Taxi 2410 38.2 (36.8 to 39.2) 7563 42.2 (41.5 to 42.9)
Car 3484 55.3 (53.8 to 56.2) 8843 49.4 (48.7 to 50.1)
Van 331 5.3 (4.5 to 5.5) 1148 6.4 (6.0 to 6.8)
Pickup 77 1.2 (0.8 to 1.2) 352 2.0 (1.8 to 2.2)
Total 6302 100 17 906 100

*First 10 min per observation period in observed direction.

†80 min per observation period.