In large parts of Scotland the car is often the only practical and convenient transport option. 95% of Scotland is rural in nature and 18% of Scotland’s population live in rural areas where access to essential services may be limited and where walking, cycling and public transport may not always be practical transport options. In this context car clubs can provide rural communities with a practical, low-cost alternative to owning a car.

The key features of a car club:

• Member-based organisations which provide access to pay-as-you-drive vehicles
• Vehicles tend to be parked in reserved parking spaces close to homes and workplaces and tend to be available on an hourly or daily basis
• Vehicles tend to be fuel efficient, low emission vehicles
• Promote behaviour change by complementing other modes of transport such as walking, cycling and public transport

This is taken from the Car Plus web site and sums up Car Bute nicely.