A few people have asked if the LapMonitor can handle two people passing it side by side. I done some testing. Be your own judge.
Take a look at the video. In the bottom right corner you can see when the transducer have contact with the Lap counter - Red light.
We can see that the rider closest to the lap counter can block for the rider further away. We see the red light flashing when it should be one solid red through the whole pass. I have been taking a closer look at for how long the rider was blocked. Most of the times it was either 0.01sec. or 0.02sec. the longest block was 0.04sec.
My thoughts… I dont think this will be a problem in real life. Could one rider end up being blocked through the whole pass. Yes I guess so. But it would be very unlikely. We only need one “contact” with the lap counter to get a timestamp. It doesn’t matter that the “contact” are broken through the pass. Its only if we are blocked at the very beginning of the pass that we can loose a little time. But in all the short track I have seen and participated in it is very seldom that two people pass the finish line that close. So my guess is that it would be a 1 out of 1000 problem.