Might need a camera focussed on the driver as well. Using a mobile/cellphone whilst driving is not an offence in the UK, but it is using a "handheld" one which crosses the line. Thought I'd mention that as it's probably different in the US.
We have vague 'distraction while driving' laws that vary by state, but they are not used to prosecute cellphone use, so every now and then, we get someone somewhere seeking to make cellphone use a clear violation, but I don't think these proposed laws get very far - too many drivers like using the phone while they're driving, and the US is a car (and a telephone) culture, so the law reflects what the lowest common denominator wants. Personally, given how lax law enforcement is when it concerns people behind a steering wheel, I'm surprised the US criminalizes drinking and driving.
You folks are lucky, living in the UK. At least there, if someone kills a cyclist, the driver is likely to see some jail time. Here in the US, drivers who kill get a friendly visit from the police, and an accident investigation that starts from a premise of 'The cyclist was clearly to blame' and goes from there. It's always surprising to me that the families of US cyclists killed on the road aren't stuck with a bill for a car wash to get the blood off the car and for the resulting work to fix the dents, not to mention the therapy visits for the 'victim' (as drivers who kill are often called - and no, I'm not exaggerating).
If you don't believe me, check these out:
http://www.thewashcycle.com/2010/09/pettigrew-death-investigation-continues-vigil-planned.html
In this one, the driver drove all the way home (4 miles!) with a bicycle lodged under her SUV. She thought she had hit an animal, but didn't bother to check. Although witnesses saw smoke and sparks coming from her vehicle, she 'didn't notice' the bike until she got out of the car. She called police and they gave her a friendly visit. They didn't even issue a hit and run citation.
http://gothamist.com/2011/10/26/mother_of_cyclist_killed_by_william.php
In this one, the truck driver left the scene of the accident and days later, when the police found him, he was not cited and the police allowed the truck to be washed clean of blood, erasing evidence. The 'investigation' effectively consisted of noting down the truck driver's and the cyclist's names. At the time, a police spokesman accused the cyclist of running a red light - yet traffic camera footage proves he did not.
