This course is the first of two in this series that focuses on the geometric design of intersections for modern roads and highways. Its contents are intended to serve as guidance and not as an absolute standard or rule.

Intersections are unique roadway elements where conflicting vehicle streams (and sometimes non-motorized users) share the same space. This area encompasses all modes of travel (pedestrian, bicycle, passenger vehicle, truck, and transit) as well as auxiliary lanes, medians, islands, sidewalks and pedestrian ramps. These may further heighten the accident potential and constrain the operational efficiency and network capacity of the urban street system.

The course objective is to give engineers and designers an in-depth look at the principles to be considered when selecting and designing roadway intersections. Upon course completion, you should be familiar with the general guidelines for roadway intersection geometric design.

Once you complete your course review, you need to take a multiple-choice quiz to earn PDH credits.

This course is intended to provide the learner with the following specific knowledge and skills:

• Basic elements of intersection design

• Types of intersections

• Sight triangles

• Intersection design vehicles

• Channelization

• Traffic islands

• Deceleration lanes

• Left-turn lane design

• Control radii for median openings

• Indirect left turns and U-turns

• Jughandles