VR, I think parking your rear hub over the sweet spots at the sensors would be the most advantageous when you are on your CF bike.

My rule of thumb for Seattle traffic sensors: 15 seconds to trigger the little red hand says 'stop' starts flashing at the intersection signal, or I proceed (once clear) under the assumption the bike will not trigger the sensors. At intersections facing off at right turn only lights, i often sneek in past the last car opposing, if I can see the light above is still green for them....I don't think this is legal in WA however...

I recommend most urban bikers get good at reading the traffic lights and walk signals that DON'T face their travel direction...