They mark the edge of the safe area, keep clear of them.
In the UK red reflectors are always shown to the rear of a vehicle, never to the front, therefore they mean you are approaching the rear of car, lorry, bike etc.
You are going the wrong way on a road.
It means you are going the wrong way
Rear reflectors are red primarily because red light is associated with warning and caution, making them highly visible to drivers approaching from behind. This color choice helps signal to other road users that a vehicle is present and may be stationary or moving slowly. Additionally, red light is less likely to cause glare and is easily distinguishable from other vehicle lights, enhancing safety on the road.
RED!
RED!
Reflectors on the back of a costume, as well as on the heels and sides of sneakers, are the best places for reflectors on a costume. A car approaching the person in costume from behind then has more of a chance of seeing that person. For young children who are unaware of road rules, it is imperative to make them visible to all drivers.
get a police
Red
You are going the wrong way. White means correct direction, red means opposite direction (wrong way), blue means a fire hydrant near.
The number of reflectors on the rear of a trailer can vary based on regulations and the specific design of the trailer. Typically, trailers are required to have at least two red reflectors on the rear, but many also include additional reflectors on the sides for visibility. It's essential to check local laws and standards to ensure compliance.
on the wrong side of the road
Apparently you need some kind of reflectors on your plate. I was told this by a state trooper but received no ticket. I picked some up local for $1