One reason would be exhaust fumes may enter the cabin area.
They may become unsafe to drive due to rust weakening parts of the car.
safety hazard
A "safety hazard" is something that could cause a person to be injured or killed.
safety hazard: causes external harm (broken leg, sprained wrist) health hazard: causes disease. EX. Safety hazard is like not smoking around certain chemical carrying equipment (ie storage tanks) health hazard is not smoking in restaurants or other public areas.
to children
danger, risk, hazard
Depends on the climate they kept in.
harmful
Can create fire as safety risk.it is a hazard by its self and one need to manage it
An opening in a wall or floor is a safety hazard and must be either covered or guarded.
The objective of a safety hazard analysis is to identify unacceptable risks and correct them before they become injuries, illnesses or property damage.
Litter can be a safety hazard if it is note adequately controlled. Uncontrolled litter can be the cause of injuries resulting from slips and falls, and can also be a fire hazard. More generally, a workplace that is neat and clean is usually a workplace with a good safety attitude and a good safety record. A workplace that is messy and littered often is not.