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People often assume because they are barely moving, or in slow heavy traffic,or at lights, it gives them a right to check their phone. If anything, these situations are the worst situations to check your phone, because the people in front could stop any moment causing you to emergency stop, or go into the back of them.
A lot of people still use their phone whilst driving, it's good to make an example of Beckham, because everyone will notice, also he's a man that can find a lift for 6 months or get a private chauffeur lol.