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INSTRUCTOR: Nazir Lalani, P.E., M.ASCE 

Purpose and Background

Sight distance is important in the design and operation of various types of road facilities. Poor sight distance can have adverse safety impacts and can result in collisions. Higher crash rates may result in tort litigation against the agency that owns the right of way. This webinar will identify the different types of sight distance that are important and the guidelines that are applicable to each type of sight distance. The discussion will include examples of locations where poor sight distance exists and explain the potential impacts of inadequate sight distance on various types of road users such as pedestrians and bicyclists. The impact of light conditions will also be covered in the discussion. The webinar will include the latest sight distance information from the recently published Seventh Edition of AASHTO's A Policy on Geometric Design of Highways and Streets (Green Book) in 2018. A reference list will be provided that includes articles, websites, and other study materials. The webinar will also be updated to include information from research reports published by the Transportation Research Board.

Learning Outcomes

• Identify at least three key parameters which impact intersecting sight distance
• Learn why passing sight distances are now consistent among three major publications
• Have an improved appreciation of why decision sight distance is two to three times as long at stopping sight distance
• Learn the ways in which sight distance is important for all road users including pedestrians and bicyclists
• Learn from questions asked by the presenter to the webinar participants and their responses

Webinar Benefits

• Gain an improved understanding of the various types of sight distances
• Obtain better understanding of the importance of sight distance in design work
• Learn how to address the sight distance needs of all road users

Intended Audience

This webinar will benefit transportation professionals (engineers and planners) who work for consultants, cities, counties, and state agencies involved in designing roadway projects. This course is designed for individuals with some background and training in designing streets and intersections who are interested in improving the safety of these types of locations and making sure applicable guidelines are being met.

Webinar Outline
 
The webinar will cover sight distance for:

• Stopping, Decision  and Passing
• Traffic Control Devices
• Intersections and Driveways
• Horizontal and Vertical Curves
• Underpasses
• Bicycle Facilities
• Railroad Crossings
• Pedestrian Crosswalks
• Drivers Turning Right Intersections Controlled By Traffic Signals
• Roundabouts
• Case Studies Where Agencies Have Suffered Lawsuits Relating To Sight Distance