When I used a roof rack, I made a bright yellow & black “TOYS ON TOP” hang tag from my review mirror. There are various ones around to find or you can make one.


I even saw one a long time ago that was magnetic and stuck to the hood in front of the driver. It was spring loaded and wind at some forward speed folded down to be largely out of sight. But when you slowed down, it popped up as a warning. This potentially overcomes the “you get used to it” aspect of a static hang sign like I used.

Either way, something of a way to remind the driver is a good idea. I know people who also move or obscure their garage door opener with a similar goal. Can work there but miss height issues out and about.