Concrete blocks to prevent vehicle parking on vacant lot left after the destruction of a building. It works like lego to store them. It can also be used to protect events. :
84″ Standard Concrete Parking Curb – BC Site Service
Plastic Parking Block
Concrete Parking Blocks — American Eagle Precast Concrete Products
Concrete Wheel Stops vs. Rubber Wheel Stops
Precast Barriers and Curbs
Rubber vs Concrete Parking Stops | Blog | Checkers Safety | Checkers-Safety
Parking Bumpers - Commercial Concrete Products
Parking Bumpers, Parking Stops, Parking Blocks in Stock - ULINE.ca