Some Cities in California are going to install K-rails along pedestrian walking areas to deter vehicles, it all gets confusing but normally a K-Rail is a lower height Jersey Barrier allowing for people to cross over them easier for safety. But both K-Rails can Jersey Barriers can be of different heights. Generally the K-Rail is 32 inches tall, and a Jersey Barrier is 4 feet or 48 inches tall. The key factor would be how they are installed, just a Jersey Barrier or K-Rail can be moved by a large Pickup Truck fairly easily. How long the barriers are can be a big factor as well. In any case at a minimum they are normally installed linked together at the ends, with pins made of rebar. For best effect they can and should be attached to the land they are standing on. How is more a detail of how long they are to be installed.