| Glossary Word | | Glossary Description | | |
| AADT - Average Annual Daily Traffic | | standard way of presenting traffic flows advocated by the Department of the Environment, Transport and the Regions, it is the total flow on a section of road in vehicles throughout the year divided by 365 (366 in a leap year). |
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| Auxiliary Power Unit (APU) | | provide a larger array of comfort features for drivers looking to reduce idling. APU's can provide heat, air conditioning, power for household electrical devices and engine heat. Most devices combine a small heater, a compressor for air conditioning and an alternator. APU's may be powered by diesel fuel directly from the tractor fuel tank, or by a bank of rechargeable batteries. Diesel driven APU's can operate for 5 hours or more on a single gallon of diesel fuel. Costs for these devices can range from $3500 to $9000, but are typically in the $6000 to $7000 range. For locomotives APUs automatically shut down the main locomotive engine idle while maintaining all vital main engine systems at greatly reduced fuel consumption. |
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| Accessibility planning | | Planning to make sure that facilities are in the right place so that everyone can reach them. Policy makers are increasingly aware that some planning decisions have not only increased car trips but also effectively excluded some groups from accessing jobs, leisure and even shopping.
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| Active travel | | Self powered transport - including walking, cycling and rollerblading. It is an important concept linking transport and healthy living.
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| Active travel | | Self powered transport - including walking, cycling and rollerblading. It is an important concept linking transport and healthy living.
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| ACTVaR - Association of Councils of the Thames Valley and Region | | A consortium of Councils in this sub-region of the South East of England that cooperate to ensure good cross-working and consistency between, for example, their LTPs.
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