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Thread: Parking deck generation rates

  1. #1

    Parking deck generation rates

    Do you guys have any idea how or where to get Parking Deck generation rates? I have a project where I have to determine the entering and exiting traffic from a parking deck which serves retail area and some part of university area.
    I would thank you all for any help in this regard.

    Thanks,
    Uday

  2. #2
    maudit anglais
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    Context, context, context. It all really depends on this.

    As a very rough rule of thumb, we use a rate of 0.5 trips per space for commercial parking facilities in the peak hour (i.e. in the busiest a.m. hour, half the spaces will fill up). This is for downtown commuter-oriented parking facilities. Your mileage may vary.

  3. #3
    Cyburbian DetroitPlanner's avatar
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    The other extreme would be parking structures associated with entertainment facilites such as theaters or sporting arenas, these begin to fill an hour before game-time (start time) and in many instances are sized according to needs, so a 20,000 seat arena will have a higher number of spots than one asscoaited with a 4-5,000 seat theatre.
    We hope for better things; it will arise from the ashes - Fr Gabriel Richard 1805

  4. #4
    Cyburbian
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    How about

    for a company that is looking to build an adjacent parking lot for their service trucks?

  5. #5
    Cyburbian Random Traffic Guy's avatar
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    In that case, the company should know how many and when their trucks enter and exit.

  6. #6
    Cyburbian Jeff's avatar
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    The ever-elusive parking generation rates...highly subjective based on the use.

  7. #7
    Cyburbian Tide's avatar
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    This is a sticky area. But don't let the deck part get you caught up. How do you assume parking demand for a large "lifestyles center" or big box complex (Target with restaurants and other mini boxes). Often you figure out the total demand based on Sqft. or other means, but there is the idea that people come for more than 1 trip so there is a sharing component often as high as 20% of the trips are there for more than 1 store. Likewise I would take all the uses that this parking deck could supply within a 2 block radius or so and then figure out how many trips would be to more than one place. Are there any larger employers that would be using this deck for their employees such as a hospital or the university? Then you would have to figure higher traffic b/t 7-9am and 4-6pm. Hope this helps gte the ball rolling.
    @GigCityPlanner

  8. #8
    Cyburbian jmello's avatar
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    Aren't the trips technically generated by the "retail area and...university area?" The garage is just concentrating some of the trips.

  9. #9
    Cyburbian
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    Besides, does one exist for a parking lot for an auto dealershp, or for auto dealerships based on the number of cars on display?

  10. #10
    Cyburbian permaplanjuneau's avatar
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    Quote Originally posted by jmello
    Aren't the trips technically generated by the "retail area and...university area?" The garage is just concentrating some of the trips.
    Calculating trip generation for a parking area is like calculating a parking requirement for a garage. It just doesn't make any sense. (a parking garage in the middle of a corn feild wouldn't ever be used--there have to be uses to attract the drivers for there to be any trip generation at all)

    As jmello says, the trips are actually generated by the uses for which the parking area is constructed. I'm not a big fan of ITE's data, but it is widely accepted in engineering and planning as the authoritative source. So I'd check ITE's Trip Generation (latest edition) and check each of the generation rates for the uses associated with the parking structure.

    Depending on how "mixed use" the development served by the garage is, you should then reduce the number of trips to account for people who park once and use multiple facilities. This number is highly context-specific, but a 20% reduction for a facility with offices, retail, restaurants, etc. is probably safe. With residences mixed in as well, the reduction could be larger, as some residents may work, live, and shop in the area and only rarely need to move their cars (if they even own cars).

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