One would assume at the point of taking this photo you had already come to a complete stop turned off your engine and removed the keys from the ignition ?, other wise this could be classed as a road traffic offence would it not ?.
While it was a nice traffic report, I think other road users safety by you maintaining 100% control of your motor car is more important.
People may find my comment harsh and unfair but if it had caused a crash and someone was hurt by this mindless act what would you be saying then ?.
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Think Road Safety