The history of interlocking pavements dates back 5000 years to the Minoans and The Romans built the first interstate system with segmental pavements over 2000 years ago. These pavers were mostly made of clay.
After World War II in the midst of rebuilding, the Netherlands experienced a shortage of coal to fire clay bricks for buildings and pavement. All the clay units made went to constructing buildings. Concrete paving units were developed as a substitute. The idea quickly spread to Germany. Both German and Dutch companies developed high efficiency concrete paver manufacturing equipment in the 1960's.
This technology spread to England, Europe, Australia, Japan, New Zealand and South Africa. Today Germany produces over one billion square feet annually.
As of 2006 North American companies sold about 800 million square feet of concrete pavers. This is a small amount compared to the 6 billion square feet sold globaly each year.
Interlocking concrete pavement has become, and is simply the best paving system in the world, due to it's flexability and strength.
Interlock is the inability of one paver to move independently of it's neighbor. This is achieved through vertical, horizontal and rotational interlock.