Why isn't the code working?

So, we're working on a train project, and I'm trying to write the code for getting the LED's at the railroad crossing to start flashing as soon as the train crosses the gate, and the code makes sense to me, but its not working correctly:

 if a.analogRead(approach)>200

    a.motorSpeed(1,200)
    int=1;
    left_light_int=0.5;
    right_light_int=1;
    tic;
    toc=5;
    time=1;
    while time<toc
        if time > left_light_int
            a.digitalWrite(14,1)
            a.digitalWrite(15,0)
            left_light_int=left_light_int + int;
        elseif time > right_light_int
            a.digitalWrite(15,1)
            a.digitalWrite(14,0)
            right_light_int=right_light_int + int;
        end
        time=time+0.5
    end 
 end

Answer 1

[Image Analyst]

Don't set toc equal to 5. It's a built-in function that returns the number of seconds since tic was called. If you want to wait 5 seconds, use pause(5). Or else use

startTime = tic;
while toc(startTime) < 5