Transport noise sources include both the mode of vehicle being used and the infrastructure that the vehicle operates within. The main sources for transport noise include:
– Roads
– Rail
– Air Travel
– Maritime

Sources of noise depends on the mode of transport but generally falls into 3 main areas which are:
– Engine noise from the Internal Combustion Engine (ICE)
– Exhaust systems
– Interaction between wheel or tyre with the road or rail surface. Tyre noise, road noise or worn tracks are the main causes of excessive noise levels.

With the popularity of electric vehicles (EV), noise from sources such as the ICE will be reduced however above speeds of around 15mph. The benefit is only expected to be 3dB (on open roads and motorways) over a vehicle powered by an ICE. This is due to the tyre/ road surface noise remaining constant between an ICE and EV powered vehicle.

Transport noise not only affects the occupants of those using the vehicle, but those in the surrounding area. Excessive noise can affect residents (in their own homes), businesses and even local wildlife. To ensure the protection of those near new and existing lines of communication, guidance is available for the calculation of noise levels.
BS 4142 allows for a rating, based on context of the noise to be made. Road traffic can be assessed using calculation of Road Traffic Noise (CRTN) and rail using a similar method, the Calculation of Rail Noise (CRN). BS 8233 is also used where traffic noise has an impact on residential properties.

Transport | Acoustic Barrier for Rail
calculation of road traffic noise (CRTN)

Assessing Infrastructure for Transport

Infrastructure refers to the facilities or structures needed for the operation of society or an enterprise (buildings, roads, rail network etc). In all cases Environmental Noise Assessments are required at planning stages to ensure that the infrastructure will not cause issues with the surrounding area. 
Depending on the infrastructure project additional criteria may need to be  met and additional information on transport planning can be found on the Government’s website

Assessing road, rail, air traffic and maritime modes

Testing and assessing a particular mode of transport (such as a vehicle or aircraft for example) and is normally undertaken by the manufacturer prior to it entering service as part of their own commitment to meet specific criteria required before any such vehicle or craft enters service.
Our primary services are to ensure that noise generated through the operation of such vehicles or craft do not have a negative impact on the surrounding environment.
Prior to any new roads or infrastructure projects being granted planning permission it is normal for environmental noise assessments to be carried out which we can assist with to ensure that they comply with documents such as The National Planning Policy Framework and Planning Policy Guidance 24 [Planning and Noise] (PPG24). PPG24 has been superseded by NPPF but may still be referenced to by some planning authorities.

Have a question concerning transport noise?

Contact us for more information how we can assist with transport noise.