• Do you ever see him under normal circumstances? Just slip it into the conversation that you've gone native and that you now really understand all road users' points of view. Stress how much fun cycling is and if he bites, offer to help him get started. Other than that, I wouldn't make any kind of aggressive or reproachful, erm, approach, as he'd just get defensive (unless you catch a really good opportunity for mentioning it), and you would be very unlikely to contribute to him stopping being inattentive.

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