| Glossary Word | | Glossary Description | | |
| AONB | | An area of land designated as an Area of Outstanding Natural Beauty. |
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| API | | American Petroleum Institute.
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| ATA | | American Trucking Associations. |
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| ATCO | | The Association of Transport Co-ordinating Officers on which we take a leading role. |
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| Automatic Tire Inflation System | | Automatic tire inflation systems monitor and continually adjust the level of pressurized air to tires, maintaining proper tire pressure even when the truck is moving. |
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| Auxiliary Power Unit (APU) | | APU\'s 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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