rural dirt road with light asphalt surface

Minnesota has thousands of miles of gravel and dirt-surfaced roads, and most of them are maintained by counties and townships. One method of preserving the surface (for dust control, stabilization, or to maintain grade) is to apply a light surface treatment. A light surface treatment (LST), also known as a bituminous surface treatment, is a thin layer of liquid asphalt covered with a layer of aggregate with a total application that is 1.5 inches thick or less. Using LSTs is relatively new, and this training will offer information about how to select the right treatment and successfully apply it.

Workshop Recording

The workshop was recorded on June 10, 2020.

Topics Covered

Who Should Attend

This training is intended for county engineering staff/design engineers as well as larger townships and counties with gravel roads that are starting to develop higher-than-average daily traffic rates.

Course Instructor

Dan Wegman, P.E., Braun Intertec, has worked with DOTs and local government agencies in several states with pavement rehabilitation and preventive maintenance strategies. As a former MnDOT construction and bituminous engineer, and with over a dozen years working as a private-sector material supplier, Wegman provides technical insight with respect to materials, construction, and implementation.


To the best of our knowledge, this course/activity meets the continuing education requirements for 3.0 PDHs as outlined in Minnesota Statute 326.107. More information concerning continuing education for professionals is online.


This workshop is presented by the Minnesota Local Technical Assistance Program (LTAP) at the Center for Transportation Studies, University of Minnesota. Minnesota LTAP is sponsored by the Minnesota Local Road Research Board (LRRB) and the Federal Highway Administration (FHWA).