Poor timing on the crossing - very dangerous!

The traffic signals here need changing. They flash green for pedestrians to cross (for a very long time) while also flashing amber for cars to "get ready", which all drivers seem to take for "put your foot down".

Today I witnessed two elderly people crossing the road by the time they reached the middle of the crossing the green man had already started to flash. The two black taxi's, waiting at the lights (one in the bus lane), then proceeded to drive at the elderly people crossing the road! The elderly man indicated to the traffic light to tell the taxi driver it was still a green man, which is was, but the taxi driver just indicated to his light, still flashing orange, and continued to edge closer to the pedestrians. The taxi driver in the bus lane then decided to beep the elderly couple as they walked past his taxi. Absolutely disgusting behaviour from two black cab drivers but something that would never have happened if the signalling wasn't set up in this manner. There are a lot of impatient drivers coming up from the old street roundabout , really I think the lights should show red for the drivers, until the green man had gone. It's too dangerous the way it is set up, as both drivers and pedestrians think it is their right to go at the same time.