[voltdr]

Maverick is correct, there are 4 beams. The way the stage lock functions is to keep the stage light on if your car backs up. The problem is, the stage lock has to release before the stage light turns off thereby starting the timers. In effect, you get more rollout than normal, your RT is slow, your 60' and 1320' is quicker. No one has been able to tell me how much back up the stage lock will allow, this then can cause erroneous times due to the different rollout due to stage lock. So you can appear to be late but run way too quick. The amount of the stage lock discrepancy is not consistent. I had one run in the gamblers race where I was about .025 late and ran out the back door to a 8.861, (opponent redlight). Not knowing the stage lock caused this issue, I dialed next round from the 8.86. The stage lock worked correctly the next round but I could only run 8.925.
Stage lock needs to be removed. Stage your carcorrectly or fix your car so it doesn't back up.
Dan