A plurality of lane boxes are provided for backup of {TAIL ~ a touch signal} and a starting block signal, in case of failure and {HEAD ~ misoperation} of the control device 
A plurality of lane boxes are provided for backup of { TAIL ~ a touch signal } and a starting block signal , in case of failure and { HEAD ~ misoperation } of the control device
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH