Device for preventing drunken driving of vehicle

A vehicle operation inhibitor control system for a vehicle having an engine, an electric power source and an electric system for controlling the engine operation when energized by said electric power source, wherein said inhibitor control system comprises:

• connect means for connecting said electric power source to said electric system when said connect means is energized;
• a display having a single screen for displaying a character on the single screen in response to a character signal applied thereto when said display is triggered by an external trigger signal;
• control means for consecutively applying a first group of character signals respectively representing a first group of characters different from one another to said display while applying a trigger signal to said display during a first time period, and applying to said display a second group of character signals respectively representing a second group of characters including at least one character in addition to said first group of characters during a second time period later than said first period;
• and
• detect means operable by the vehicle operator for energizing said connect means at each time when one character of said first group is displayed by said display during said second period.