Acceleration, deceleration, and stopping sight distance (SSD) criteria are key factors in determining roadway geometric design requirements. These elements are influenced by variables such as grade, vehicle type, maneuver type, brake reaction time, object height, and driver’s eye height. This webinar will cover the findings from recent studies that assess design policies related to these criteria and informed recommendations for updates to the AASHTO Green Book.

Related TRB Report:
NCHRP Research Report 1081: Acceleration, Deceleration, and Stopping Sight Distance Criteria for Geometric Design of Highways and Streets

A quality assurance program ensures that materials and construction meet the requirements of approved plans and specifications. Given the high turnover in the pavement and materials field, uniform guidance is essential for training new engineers, technicians, and inspectors. This webinar will provide an introduction to quality assurance components; discuss variability, risks, and pay factors; and identify indicators of material certification testing fraud. It is the first of a two-part webinar.

To optimize supply chain operations, public and private freight planning stakeholders must harmonize decision-making related to infrastructure investments. This webinar will focus on performance management for freight demand and demand elasticity.

Assessing conditions on bridge decks with non-destructive evaluation (NDE) technologies may reduce operating costs and extend lifecycles. It fosters cost-effective and timely interventions. This webinar will showcase the integration of NDE results into the bridge preservation decision-making process.