Presentation on theme: "Lec 10, Ch.4, pp.121-127: Parking studies (objectives) Understand parking planning is an integral part of transportation planning Know the definition of."— Presentation transcript:
Lec 10, Ch.4, pp : Parking studies (objectives) Understand parking planning is an integral part of transportation planning Know the definition of parking terms Learn the methodology of parking studies Learn how to find out space requirements for a parking garage
What we cover today in class… Why do we need to conduct parking studies Types of parking facilities Definition of terms related to parking studies Steps of parking studies Steps of analyzing parking data
Types of parking facilities On-street parking facilities: Off-street parking facilities: Private vs. Public Surface lots vs. garages Self-parking vs. attendant-parking Parking bays alongside the curb Question: What kind of parking do we have in downtown Provo?
Definitions of parking terms Space-hourA unit of parking defining the use of a single parking space for a period of 1 hr. Parking volume The total number of vehicles that park in a study area during specific length of time (usually a day) Parking accumulation The number of parked vehicles in a study are at any specified time. Parking loadThe area under the accumulation curve between two specific times. (space-hours) Parking duration The length of time a vehicle is parked at a parking bay. Parking turnover The rate of use of a parking space. Divide the parking volume for a specified period by the number of parking spaces.
Four steps of parking studies 1. Inventory of existing parking facilities 2. Collection of data on parking accumulation, parking turnover, and parking duration 3. Identification of parking generators 4. Collection of information on parking demand
Info included in parking studies Parker characteristics (when, where, why and how many people park) Parking supply characteristics (number, location and cost of spaces, who provides and how spaces are controlled and used) Parking needs for new or existing developments
Demand Factors Changes in population, motor vehicle registrations, and travel Changes in CBD employment, floor space, new economic activity generators and loss of existing generators, competition from outlying areas Economic factors relating to a specific parking project (competitive price changes, subsidies, development of competitive parking facilities) Change in public transit availability, service and usage, or other changes in CBD accessibility Public policies regarding parking and transit Technology or science affecting transportation, new laws and regulations affecting motor travel, energy or fuel shortages, and community and national economic health
Inventory of existing parking facilities Type and number of parking spaces Times of operation and limit on duration of parking Type of ownership Parking fees Restrictions on use Other restrictions (near bus stop, fire hydrant) Probable degree of permanency
Collection of parking data Accumulation – checked about every 2-hr basis Turnover and (max permissible) duration T = (No. of different vehicles parked)/ (No. of parking spaces) Time of day No. of parked cars Demand fluctuates.
Identification of parking generators Spacial distribution, size of parking generators (trip attraction facilities), and available transportation modes affect the level of parking demand.
Parking demand survey Interview drivers on a typical weekday between 8:00 am and 10:00 pm. Or, give drivers a survey form Trip origin Trip purpose Destination after parking Arrival and departure Vehicle type If you get 30% back, you are really fortunate.
Analysis of parking data No. and duration for vehicles legally parked No. and duration for vehicles illegally parked Space-hours of demand for parking Supply of parking facilities
Parking demand estimation D = space vehicle-hours demand for a specific period of time (usually the duration the parking facility is open) N = number of classes of parking duration ranges (commuters, shoppers, business meetings, etc. Class means grouping of purpose and parking durations) t i = midparking (meaning average here) duration of the i-th class. n i = number of vehicles parked for the i-th duration range (meaning class) Class N (= 2 here) Average duration t i No. of vehicles n i Commuter9 hrs120 Shopper2 hrs80
Parking supply estimation S = practical number of space-hours of supply for a specific period of time M = number of parking spaces available t j = total length of time in hours when the j-th space can be legally parked on during the specific period f = efficiency factor to take into account the time lost during turnovers Simply stated: S = f*t ave/space *M j = 1, 2, 3,… 10hrs