Mobile phone usage doesn't show up on camera very well, especially if the vehicle is moving - I guess the glass reflections cause problems even if we can see it perfectly.
Was nearly hit today by a car drifting into the cycle lane - the driver was texting and steering with his knees. Later on the driver in front of me at the lights was busy talking into his handheld and set off at the light change by steering inbetween gear changes with one hand. This was in the space of a cycle trip of 2 miles to the shops. Handheld Mobile use is utterly endemic these days. With bluetooth sets costing less than £20 there is absolutely no excuse.