Quoted from gr3mlin:My next mod will be a sign above the lock lane that changes to reflect if the lane is open for locking a ball or not and when that is done ill post the instructions on how to create it.
If this is a small led, lcd or any other type of display that looks like an actual construction sign you'd see on the road... it's already been done as well. Maybe utilize your time better by inventing some sort of drinking game that only needs a ping-pong ball and a red solo cup!