It is dangerous to use mobile phone when driving. But it is most dangerous if a driver is playing PSP when driving.
In UK, a Bus Driver was kicked from his work:
A BUS driver has been fired for playing computer game Grand Theft Auto — while at the WHEEL.Steve Allcock was reported by terrified passengers who heard the screams of characters being butchered as he drove between stops.
Bosses fired him after on-board CCTV footage showed he had the handheld device on his knees.(LINK)
This driver doesn’t only frighten his passengers by the screams of the character in his PSP but by just looking at him playing a PSP while driving.
If I am one of the passenger of this bus, the driver will surely receive a slap of my slipper into his bald head.