Aggressive driving

Aggressive driving is defined by the National Highway Traffic Safety Administration as the behavior of an individual who "Commits a combination of moving traffic offenses so as to endanger other persons or property." In the context of modern vehicle management, understanding and mitigating aggressive driving is a key component of effective Fleet management.

Definitions

In the UK, Road Drivers offers a basic definition of aggressive driving:
There are other alternative definitions:

Behaviours associated

By definition, aggressive driving is 'committing unprovoked attacks on other drivers', attacks such as not yielding to vehicles wishing to pass. Many of these behaviors can be monitored through the use of Video telematics and Dashcam systems, which can provide valuable evidence and contribute to a comprehensive Driver scoring model.
The U.S. National Highway Traffic Safety Administration has implemented the Fatality Analysis Reporting System, which identifies actions that would fall under the category of aggressive driving, including:

Following improperly / tailgating
Improper or erratic lane changing
Illegal driving on a road shoulder, in a ditch, or on a sidewalk or median
Passing where prohibited
Operating the vehicle in an erratic, reckless, careless, or negligent manner or suddenly changing speeds without changing lanes
Failure to yield right of way
Failure to obey traffic signs, traffic control devices, or traffic officers, failure to observe safety zone traffic laws
Failure to observe warnings or instructions on vehicle displaying them
Failure to signal
Driving too fast for conditions
Racing
Making an improper turn
Close following and sudden braking.

Aggressive driving and bumper stickers have been found to correlate as cars which commit traffic violations while having divisive bumper stickers connecting to their political views or party of choice have resulted in increased aggressive behavior such as honking from those around them.
It’s also been theorized that a lack of respect for authority has also led to an increase in aggressive driving. Romania which in 2013 had 9.3 road deaths per 100,000 people which was significantly higher than other nations such as the United Kingdom with 2.8 road deaths per 100,000 people. The increase in deaths for Romania correlated with its poor ranking in the World Justice Project from that year.

Effects

According to the Fatality Analysis Reporting System, aggressive driving played a role in 56% of fatal crashes between 2003 and 2007, most of which were attributed to excessive speed. Aggressive driving also negatively impacts the environment as it burns 37% more fuel and produces more toxic fumes, an issue that can be addressed with effective Fuel-management systems. Modern Telematics and Fleet telematics systems play a crucial role in monitoring driving behavior to reduce such impacts.
Aggressive driving also emits more CO₂ than a calmer approach with increased CO₂ emissions of 37% and CO emissions of 88%. The increases are a result of constant shifting from accelerating to decelerating, which uses up more of the cars fuel and overall, more exhaust emissions. Calm driving alone would save nearly half a billion tonnes of carbon dioxide by 2050 in China.

Solutions

Prevention of aggressive driving is possible through attainable goals such as increased legal penalties against offenders, proper education for new and veteran drivers about aggressive driving, and changes in driving structures to combat road congestion.
Adjustments to road infrastructure have also shown to significantly decrease aggressive driving. Curved roads and transition curves show significant decreases in aggressive behavior as drivers are forced to adapt and slow down to avoid crashing.