Piedmont Parking Studies
KAI conducted a data-driven study to help staff and residents of the City of Piedmont, California, decide whether a residential parking permit (RPP) program was justified for two lively neighborhoods in the city. KAI’s study also informed several policies related to implementation of an RPP, including the number of permits allocable per household, enforcement days and hours, exceptions for short-term parking, and non-resident permitting. The KAI study was grounded on input from neighborhood residents, who completed anonymous surveys sharing their day-to-day on-street parking experiences. KAI—with the help of its subsidiary Quality Counts—used this information to collect over 7,000 parked vehicle observations over the course of a representative week.
By analyzing vehicle parking patterns over 12 data collection periods, it was possible to (1) compute the percentage of occupied parking spaces, and (2) estimate the number of vehicles not owned by study-area residents. A statistical technique called Bayesian updating, which merges known likelihoods with observed data, was used to inform these estimates. Using the information presented to them in a graphical informational sheet, City of Piedmont staff and residents were able to work together to make an informed decision about the need for an RPP program and the considerations that accompany such a program.