Labor Day does not mean a day of labor in the US. Labor Day is a legal holiday so it means if you do work that day you get paid your hour wage plus half your hourly wage as well because it is a legal holiday.
Labor Day is the first Monday in September this allows workers to have a long weekend and the opportunity to make trips they wouldn't normally have time to take. This creates a lot of traffic accidents since most people travel long distances then try to rush back home in time for work on Tuesday. It is also a weekend of drinking and parties. Many party goers don't realize they are not capable of driving so either end up in an accident or in jail.
Labor Day weekend is so dangerous that more police patrol the roads than they normally do. They stop cars they believe aren't safe because the driver is drinking or is having some type of problem and could cause an accident. Most drivers end up with a trip to the hospital for a alcohol blood test, then a family member picks them up and takes them home. When they sober up it is to find they have stiff fine to pay and their name is in the local newspaper for DUI (driving under the influence).
Labor Day is a national holiday not a local one so everyone in the US takes advantage of the long weekend. It may be a holiday for workers but it keeps the police busy trying to keep drugs and alcohol users off the road.