thereof u2014 including pin numbers for the integrated circuits note that for clarity it should be understood that all numerals indicated in drawings figures fig3 a and 3b are either pin numbers part numbers or a part value u2014 the difference between each being well understood by those skilled in the art u2014 unless such numeral is accompanied by a curved lead line in which case it is a u2018 reference numeral u2019 particular to the present description of the invention the functionality of the circuitry can be readily determined by those skilled in the art and certainly can be implemented thereby without undue experimentation such functionality is however more readily understood by cursory examination with reference to the higher level block diagram provided in fig4 fig4 illustrates the control circuit 50 including a first square wave generator 41 which drives the left head light 16 l and which drives the right head light 16 r through an inverter 44 accordingly the first square wave generator 41 alternately and mutually exclusively illuminates the left head light 16 l and right head light 16 r in addition a clock generator 46 generates a pulse which drives a decade counter 48 the decade counter sequentially enables four of its ten outputs q 0 through q 10 with each pulse from the clock generator 46 and then repeats the sequence in accordance with the purposes of the present invention the first second third and fourth light bar leds 21 22 23 and 24 are connected to outputs q 0 through q 3 of the decade counter accordingly with each pulse of the clock.