Okay, there are a couple of problems here

No, I don't mean with the idea of putting reflectors on animals in a region where it's dark all day:

Norwegian reindeer owners have a Christmas safety tip for Santa -- put reflectors on his fleet-footed animals so they won't get hit by cars.

About 2,000 reindeer have been fitted this month with reflective yellow collars or small antler tags to cut down on the car crashes that now kill 500 reindeer a year and pose a danger to motorists across Arctic Norway.

"It really works," Kristian Oevernes, the leader of the project at the Norwegian Public Roads Administration, told Reuters of the project in Finnmark, where the sun does not rise in mid-winter.

The problem here is that this would be good advice for Santa Claus if he used the roads that the rest of us travel on, but he has a fleet of magical, flying reindeer. Hell, he even parks them on the roof while he's breaking into your house. If you crash into Santa's sleigh, it's really your problem, not his.