This web seminar will focus on the safety impacts of geometric design and signalization decisions related to turn lane options. How the need for a turn lane is determined will be briefly discussed and the basics of traditional and offset turn lane design and signalization summarized. The crash reduction factors available for turn lane geometric design and signalization decisions will be introduced and the results of any new research that are believe to be helpful will be noted. The web seminar will conclude with a sample application of its content to a case study location.

At the conclusion of the course, participants should be able to:

1) Define turn lane benefits and the methods available to help determine whether turn lanes should be implemented
2) Identify the turn lane design and signalization decisions that may impact safety
3) Describe the existing crash reduction factors and/or research results that can be used to quantify the safety impacts of turn lane design and signalization decisions
4) Apply the crash reduction factors and/or research results during a turn lane design and signalization decision-making process

Keith Knapp, Traffic and Safety Engineer, Traffic Analysis and Design, Inc., Wausau, WI, USA

Keith Knapp, P.E. is a Traffic and Safety Engineer with the firm Traffic Analysis and Design, Inc. He has more than 18 years of experience in roadway planning and design, safety improvements, research, and training. His consulting and research projects have generally focused on design and the evaluation of safety and operational impacts due to various roadway characteristics. He has developed, offered, or been an instructor for more than 40 professional development training courses that have focused on a variety of subjects (e.g., intersection operations and safety, roundabouts, rural roadway and urban street design, signalization, and pedestrian/bicycle facilities).