Drivers may not be color blind. A driver must be capable of perceiving a forced whisper in the better ear at not less than five feet, with or without the use of a hearing aid. All drivers must be able to read and speak English well enough to understand traffic signs, prepare required reports, and speak with law enforcement authorities and the public. Most states have adopted similar rules for intrastate drivers. Strict regulations forbid the use of alcohol or drugs prior to or while operating commercial vehicles.
Drivers are subject to drug and alcohol testing by their employers and by law enforcement officials.
A driver must have no current clinical diagnosis of alcoholism, and must not use any drugs which could affect his or her ability to safely operate a commercial motor vehicle. These drivers have more contact with customers than do long-haul drivers, and usually make many more stops each day. Those in route-sales often need sales skills as well as driving skills. Specialized trucking involves operating specialized trucks that handle unusual, oversized or sensitive loads. Drivers cover local and long-distance routes, and need extra training to operate their equipment.