A ride leveler system in vehicles with an adjustable wheel suspension device between a vehicle wheel and the vehicle body, with a height sensor for measuring the actual height between the vehicle wheel and the vehicle body, and with an electronic control device which specifies a target height and adjusts the wheel suspension device until the attainment of the target height. The control circuits provide an override condition for selectively allowing the cutting blades of the lawn mower to operate when the vehicle is traveling in reverse. A statistical distribution is calculated for each of the functional blocks. Primary transfer molding using the lower mold and a primary upper mold can be carried out to form a plurality of frame bodies so as to surround the respective optical semiconductor elements. The thread switch logic has a time-out register which forces a thread switch when execution of the active thread in the multithreaded processor exceeds a programmable period of time.