For example, in similar circumstances halving or doubling the traffic volume will only produce a change of approximately 3 dBA either way, which is at the threshold of the human ability to tell the difference. Methods which can address this issue follow on from the variables affecting the noise. The Council is doing these last three where the opportunity presents itself. Car based transport systems enable urban sprawl, which promotes car based transport systems for mobility. Low density suburbs are expensive to provide with roads, sewers, water and energy, but are even more expensive for public transport.
Low density sprawling urban areas reduce the life supporting capacity of rural land.
If energy sources reduce or become too expensive the outer suburbs will become unsustainable. In reality our cities will change very slowly, but the right changes to mobility patterns can be encouraged. Reference staff at the Central Library are available to assist with research projects, as are staff at the Environment Centre. For answers to specific questions students will be required to ring and make an appointment for interviews with practitioners or put their questions in writing.