I use them on my cars when I've had to park them in a high traffic area. Figure it can't hurt to make the car more visible.

The power used is very low (30w on my TDI, 40w on the Benz), so you can leave them on for hours with no problem.

-Jason

__________________
1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.