Abstract The assessment of BRT/Rapid Bus service and infrastructure improvements’ impact upon corridor businesses has been inadequate. Many public workshops and community outreach efforts fall short of gaining a balanced perspective of analyzing the positive or negative impact of implemented BRT/Rapid Bus improvements upon transit corridor businesses, their customers, working employees or ultimately the corridor businesses’ sales and vitality. This research study compares by survey, interviews, and the photo design audits of four different levels of BRT/Rapid Bus and basic bus systems’ service and infrastructure improvements along four metropolitan transit corridor business communities with similar and diverse land-use characteristics, business types, and social-economic characteristics. The selected BRT/Rapid Bus corridor segments have implemented different types and levels of bus transit improvement “system packages” with different service and infrastructure attributes including Rapid Bus with Signal Priority Technologies (Smart Corridors), and proposed advanced BRT with exclusive bus lanes, while trying to balance transit corridor business and community multi-modal transportation needs with BRT/Rapid Bus improvements. To successfully meet the transportation needs and travel demand of all local community transportation improvement stakeholders, there is a need to analyze and measure BRT/Rapid Bus impacts prior to and after BRT/Rapid Bus corridor improvements have been implemented. The research results and conclusions reached can also aid transportation planners and managers in accessing the need for service and infrastructure changes in the existing studied transit corridors and future BRT/Rapid Bus system installations