The DSA (Driving Standards Agency) is a division of the UK Department of Transport, responsible for:

• The quality of tests.
• Managing driving tests.
• The quality of Driving Instructors and Trainers.
• The standards for driving education.
• The investigate driving and identity related crimes.

The DSA's main mission is to reduce auto related injuries and fatalities.

For more info visit the DSA's official site Driving Standards Agency.