A mud flap holder assembly includes a mud flap support clip bifurcated at one of the ends thereof to define an open ended variable width slot. Many different handshaking protocols are available, and they are typically implemented in an ad hoc manner suited to the current design. The microchip can control the connection of the load to the battery in different ways according to the manner of operation of the signal switch. One of the first and second machine parts is stationary and the other one of first and second machine parts is moveable.