Cycling is very popular in Holland because of the topography, density of the population and government policies to encourage cycling. Several Demonstration Projects have been set up to evaluate bicycle traffic. An account is given here of the Delft bicycle network which so far consists of 2 large tunnels, 3 bridges, 3.3 km of new bicycle tracks, 2.6 km of streets bi-directional for cycles but one-way for cars, 8.5 km of bicycle lanes and tracks and 10 km of new asphalt pavement. Studies have had 3 aims. To evaluate the effectiveness of the plan in stimulating bicycle use and its effects on safety, to test the traffic engineering principles and to monitor behavioural changes in road users. Before and after studies were carried out in 1982/3 and 1985/6 with separate evaluations of a cycle bridge and cycle tunnel. Cycling was found to have increased by at least 6%. Between 1982 and 1985 there was a 10% increase in car use nationally but in Delft this remained stable with a decrease for internal trips. Several conclusions are drawn as a result of the study. A coherent and consistent hierarchical network of bicycle facilities promotes cycling considerably. Journey time is probably the most important factor for cyclists. A logical network which can form a mental map encourages cycling. A positive attitude by the local authority is essential.
Abstract