Diazepam Drug Driving Limit = 550 µg/L
Diazepam is marketed in over 500 brands throughout the world was first marketed as Valium. It is commonly used to treat a wide range of conditions, including anxiety, panic attacks, insomnia, seizures, muscle spasms (such as in tetanus cases), restless legs syndrome, alcohol withdrawal syndrome, benzodiazepine withdrawal syndrome, opiate withdrawal syndrome, and Ménière’s disease. It may also be used before certain medical procedures (such asendoscopies) to reduce tension and anxiety, and in some surgical procedures to induce amnesia It possesses anxiolytic (reduces anxiety), anticonvulsant, hypnotic, sedative, skeletal muscle relaxant, and amnestic properties.
http://en.wikipedia.org/wiki/Diazepam