KAI is a national leader in the planning, design, and operations of roundabouts. Over the past 20 years, KAI staff has been involved in the feasibility study, peer review, and final design of over 500 potential or constructed roundabouts throughout the United States and Canada. KAI led the most comprehensive research study of roundabouts in the United States (NCHRP Report 572, Applying Roundabouts in the United States), giving KAI a particular sensitivity to how Americans operate roundabouts and how they might use roundabouts differently than what is seen internationally. KAI also led the development of FHWA's Roundabouts: An Informational Guide (2000), as well as the guide's 2nd edition (NCHRP Report 672), as part of NCHRP Project 3-65A. Additionally, KAI has prepared supplements to the FHWA Roundabout Guide for the states of California, Arizona, Kansas, Maryland, and Pennsylvania, and played lead roles in recent updates to the Manual on Uniform Traffic Control Devices and the Highway Capacity Manual (HCM). KAI was also part of the NCHRP 3-78 research team that evaluated treatments for accommodating visually impaired pedestrians at roundabouts and channelized turn lanes.