Don’t accelerate when approaching traffic lights
When you are driving, try to notice the traffic lights as soon as possible. If you find a crossroad or pedestrian crossing ahead of you, do not accelerate your car before passing it. When approaching the lights you need to slow down anyway, so all the fuel used for acceleration before would be wasted.
Also if your speed is too high and you start braking just before the crossroad, you are risking that the cars behind you may not be able to react fast enough and might hit your back.