Examining the lateral positioning and clearance of cyclists and motor vehicles in Christchurch, New Zealand

The New Zealand government has introduced cycleways on existing narrow roads, leading to disruptions and inconsistencies for both motorists and cyclists. The effect on their behaviour about positioning, however, remains uncertain. This research paper investigated lateral positioning and lateral clearance using multiple Internet of Things prototypes to quantify the relationship between motor vehicles and cyclists. Two methods were used: (1) sensors mounted on the pavement curb to collect positioning data, and (2) sensors mounted on a cyclist to collect lateral clearance data. Results show that heavy vehicles have the highest encroachment rate. Additionally, the cycleway helps steer motorists slightly farther away from cyclists while passing. The lateral clearance between cyclists and motorists on roads with cycle lanes is higher than on roads without cycle lanes. It was found that over 90% of motor vehicles meet the 1 m separation standard, as recommended by the NZ Cycling Safety Panel.