I don't know that it changes faster, but it can help the sensor "see" that a vehicle is present. At work we have a gate that lowers automatically at night. I have to lean my bike over on its side in order to trip the sensor that raises the gate. No doubt the same dynamic is at work with traffic signals.
2011 Jamis Quest "Cy"
2009 Trek 7500 "Diesel"
2008 Rans Stratus LE recumbent "The 'Bentley"