Abstract: A method and apparatus for applying colored foam markers to road surfaces as a means of temporarily changing or outlining traffic patterns. In the preferred embodiment, dissoluble foam markers would be periodically deposited upon the road behind a work crew to alert motorists of a potential hazard ahead, in order to avoid any collisions between the motorist and the work crew. As the work crew would move up on the road, the foam markers would naturally dissipate and substantially disappear over a predetermined or a relatively short period of time so that the roadway automatically returned to its original traffic pattern when the work crew has left the area. Foam markers according to the present invention would enhance the safety of a work crew's operations and increase work output by freeing the work crew from the obligation of retrieving the markers after they are used.