A interlocking highway barrier structure and system are described in which rigid upright barrier sections are disposed end to end in interlocking relationship with one another. Each of the sections of the system can have a grooved end to accommodate and engage with a similar adjacent end of the section next to it. The ends of each section of the system are provided with interlock plates for connecting together the adjacent sections. Each interlock plate is attached to its respective section and has an extending vertical edge which is bent into a "U" shaped cross-section to engage a similar edge or lip on the interlock plate of the adjacent section such that lateral movement of the respective plates and sections is prevented. The respective sections of the system can, however, be easily implaced or removed by vertically displacing the sections.