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Well after taking a meter to my malfunctioning lanes. I've discovered that I need to better isolate the phototransistors from each other. They are receiving light from Lasers other than the one intended for them. I got a reaction from all the transistors no matter which Laser I blocked. My plan is to recess the transistors inside the PVC with a black tube surrounding each one. Then I will shoot the Lasers through a hole in the PVC. I have tested it with cars now and need to better shore up my construction as after a couple of guard rail hits I knocked the Lasers out of alignment. After I work a few bugs out I think this should work.
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