<p>You can let him “drive” but that doesn’t mean people in the passenger seat don’t comment when the driver is going too fast or doesn’t see that car.</p>
<p>Let him know he is driving but do your own research and bring up any points that you think he needs to consider to make the best decision. And present it just like that. That it is his decision but based on your research, he should know xyz to add to his pool of info.</p>