In 1983, the Urban Land Institute (ULI) published the seminal work, Shared Parking.  That document established the now widely accepted idea that two or more land uses could share the same parking space due to hourly, daily, or seasonal variations and relationships (or synergy) among land uses that result in visiting multiple uses during the same auto trip.

Mr. Wells served a member of the working group of parking experts that produced the Second Edition of Shared Parking. 

The Second Edition includes a shared parking model featuring updated default values for base parking indices; hourly, daily, and seasonal demands variations; synergy (or captivity) factors; non-auto mode splits; and average auto occupancy. Visitor/customer, employee/resident and reserved parking demands are calculated separately. The model calculates the parking needs in each hour of the day from 6 AM to midnight, weekdays and weekend, for each month.

Shared parking is applicable in traditional downtowns, mixed-use real estate developments, town centers, shopping centers, and other major activity centers.  Cases studies in the Second Edition demonstrate shared parking.

The Second Edition provides guidelines for evaluating potential parking facilities and allocation of spaces to each facility, confirming physical relationships among uses to encourage shared parking, and recommending a parking management plan to achieve projected shared parking.