we use something similar on driving courses with a man in a guerilla suit i never saw him either it relates to you only see what you are looking for eg if your at a junction if you dont look for a motorbike you wont see him good clip
I will really try to get it right. I mean it will need a new system to cope with all the interest generated and new software, but it may be worth it. I hope I can afford all this and still have enough cash to get a ticket.