Clear identification of motor vehicle controls is necessary for safe operation of a vehicle. Identification of some well-known symbols and some new symbols was investigated by inquiries. Differences in identification between trained and untrained subjects are shown (employees of a vehicle manufacturer versus factory visitors). Influences of sex, age, and professional education are evaluated. The learning effect of identification before and after a purposeful training was investigated by an additional inquiry of factory visitors.The result showed no significant influence of sex, age, professional experience, or ownership of a driver license on the identification after training. This improves the chance of eliminating symbols of insufficient identification.