many times more convenient
  than concrete. no heavy equipment needed. additional reflective devices must be
  used with concrete barriers to increase visibility. safety barricade, plastic barrier, portable barrier alignment at the base helps keep
  barricades in position over uneven ground and for the duration of the project.
  no additional components required. not limited to level surfaces. more effective and safer than
  drums, cones or other barricades. \'road-runner\' safety barricades are visually
  more substantial. they command the respect of drivers and can be noticed from a
  greater distance away. drivers can more quickly determine the route or lane
  change ahead.