TRB Webinar: Driving Surface Aggregate – Improving Performance and Sustainability

November 13, 2019 02:00 PM - 03:30 PM U.S. Eastern
Cost (for your seat)
Professional Development Hours for this webinar
1.50 hour(s)
Continuing Education Hours for this webinar
AAE: 0.00 hour(s)
AICP: 0.00 hour(s)
CLE: 0.00 hour(s)

Pavement engineers are invited to a TRB webinar on Wednesday, November 13, 2019, from 2:00 PM to 3:30 PM ET. The webinar will provide an overview of driving surface aggregate (DSA) and how it can improve the performance and sustainability of unpaved, low volume roads. DSA is an aggregate specification developed by Penn State’s Center for Dirt and Gravel Road Studies, designed to achieve maximum compaction and resist erosion. The gradation of DSA, coupled with the recommended moisture and placement guidelines, may result in a smoother, more tightly bound surface that preserves fine materials, rather than allowing materials to escape as sediment or dust. The presenters will also discuss the benefits and limitations of DSA, including full life-cycle considerations.

This webinar was organized by the TRB Standing Committee on Low Volume Roads.

Some registrants will need to pay $95 to attend this webinar.  Sign into to view registration information.

Webinar Presenters

  • Bethany Kunz, U.S. Geological Survey
  • Maureen Kestler, Retired U.S. Army Corps of Engineers
  • Steve Bloser, Penn State University
  • Eric Chase, Penn State University

Moderated by: Brandon Jutz, U.S. Fish and Wildlife Service

Webinar Outline

  1. Challenges and solutions of driving surface aggregate (DSA)
  2. Field sites
  3. Construction
  4. Performance quantification
  5. Sediment runoff
  6. Dust production
  7. Road surface condition
  8. Summary
  9. Question and answer session

The first 60 minutes of the webinar will be for presentations and the final 30 minutes will be reserved for audience questions.

Learning Objectives

At the end of this webinar, participants will be able to:

  1. Describe DSA’s composition and recommended placement
  2. Identify potential benefits of DSA installation
  3. Describe site-specific factors influencing the success of DSA

Professional Development Hour Information

A certificate for 1.5 Professional Development Hours (PDHs) will be provided to Professional Engineers (PEs) who register and attend the webinar as an individual. For approved webinars, TRB’s webinar program awards Registered Continuing Education Provider (RCEP) Professional Development Hour (PDH) credits associated with participation only to the registered individual and not to other members of a group that view the webinar together. To receive PDH credits, please register as an individual and sign into the webinar from your personal computer. After doing this, you may join your group in a meeting room.  To be eligible for the credits, individuals must remain signed in for the entire webinar, including for any question and answer session following the presentations.

In addition, advance registration is available until just before the webinar starts. Once the webinar starts, you will be unable to submit your registration. Individuals that are registered for a webinar but do not receive their confirmation emails due to their organization’s internal firewalls should contact the TRB Helpdesk ( for assistance in signing in.

Individuals registered as Florida PEs are no longer required to email TRB with your license number to report your attendance. Instead, please use your certificate that TRB provides through as verification of your attendance to the Florida Board of Professional Engineers.

Please check with your licensing board to ensure that TRB webinar PDHs are approved by your board.

This webinar was developed in March 2019. TRB has met the standards and requirements of the Registered Continuing Education Program (RCEP). Credit earned on completion of this program will be reported to RCEP by TRB. Complaints about registered providers may be sent to RCEP, 1015 15th Street, NW, 8th Floor, Washington, DC 20005. Website:

Registration questions? Contact Reggie Gillum at