This report is based on a literature review, compiled research and development results on how parking conditions affect transportation choices. The report also discusses parking as a planning area, measures in parking policies, consequences for urban transport and urban development, and the need for overall parking strategies and plans linked to the traffic and urban planning in general.
The parking market works in practice poorly in most cities. The cost to park is more or less consciously subsidized and distributed to a large extent on rents, property prices, commodity prices, wages, etc. in a non-transparent manner. Those who park their cars are rarely able to weigh their own benefit of parking against the actual cost of providing the parking lot. Demand for parking in cities is therefore artificially high, in an economic sense. It is not unusual that there are direct anomalies in the market such as residential parking fees in combination with by employers provided free parking which makes it profitable to move the car from home to work during daytime, with obvious implications for the mode choice. Subsidization also means that those who do not use the car parks often, or not at all, subsidize those who use the parking lot.
To have the intended effect of policies and measures concerning parking, it is therefore essential to pass on as much of the parking supply as possible to the open parking market where prices reflect the actual costs. With a consumer-driven balance between supply and demand as a base, different parking policies can be formulated to affect urban traffic volumes and modal shares. The literature review shows that parking measures are quite central to influence mode choices in urban transport. A city-wide transport strategy or a transport plan are not complete as long as parking is not supported on the same level as other parts of the city's transport system.
Parking market is divided into different segments, which is an important prerequisite for parking policies. The efficient functioning of visitor parking can have a significant positive impact on urban economic development. Parking policies should be directed to achieve optimal capacity utilization, minimize search traffic and avoid blocking long-term parking. The price elasticity of visitor parking is low and the rate does not affect the choice to visit the inner city to any great extent in medium sized and large cities with attractive centre areas. On the contrary, a properly designed policy for visitor parking will allow more visitors into the inner city.
The conditions of parking are very important for individuals' choice of transport mode for journeys to work. If an employer offers free parking, or low parking fees, a large proportion of the employees will use the car to work. If the opposite is the case, a larger proportion will cycle, walk or use public transport. Surveys show that mode choices can vary significantly between sites with broadly similar location but with different opportunities for the employees to park. As long as there are plenty of cheap or free parking spaces there are only limited possibilities to influence modal choice by means of measures such as improved public transport, better conditions for walking and cycling, etc. However, if the supply of parking space is limited and/or fees are raised, generally the effect on mode choice is large. Parking policy through changes in supply and price of parking at the workplace is therefore an area of great potential to influence the modal share and traffic volumes in urban areas.
Car parks for residents should be provided in parking facilities. Revenue collection should be based on a fixed price for a longer period of time, e.g. a month, not to give incentives to move the car during the day. Minimum parking standards for real estate constructions build in car use and parking needs in the city following historical patterns and force low-frequency car park users to subsidize other people's car parks by housing costs. Options that maximize the amount of parking lots and enhance flexible use of the available supply should be applied on a wider scale.
The literature shows that traffic strategies and transport plans are not complete as long as parking is not dealt with on the same level and with the same ambitions as other parts of the city's transport system, such as car traffic and public transport. Decided goals concerning changed modal split, increased travel by public transport, walking and cycling, targets for inner city development and growth, etc. must be based on a properly designed parking policy to be realized. This conclusion is even more important if the starting point is a wide range of free or cheap, subsidized parking spaces spread out in the city, as is often the case.
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