Transportation agencies have reduced motor vehicle lane widths from the conventional 12 feet to as narrow as 9–10 feet in many cases to accommodate non-motorized users and reduce motorist speeds. The narrowed lanes have posed concerns for bus transit operators. On behalf of the Capital Metropolitan Transportation Authority, TTI researchers conducted a multi-faceted study including a comprehensive literature review, interviews of cities and transit agencies experiencing similar struggles, and a statistical analysis of bus crashes on different lane widths with and without barriers such as curbs or parked cars