Let's drive- economically
If he shows onto short time has to stop, let him not time the braking so, that directly at the traffic signal, you are catching up with the slowing car standing because of anything, let him be needed for one or two metres behind it to stand after intensive deceleration. Slow down some, that from the last car, masini,  or from the lamp onto 30-40 metres, already only 10-15 km/hours let him be rolling in order to provide an opportunity to himself for it with this, that let him avoid the full stop, in as much the lamp would change to green one meanwhile, you are it cars would get underway.Let him observe the change rhythm of the lamps on an often-used route, and let him tailor his velocity to this. (In single crossroads according to the change rhythm of the lamps, the times of day, concerned workday - a high day may change in relation. Let him be aware of this!)