Lots with easily controlled ingress and egress will work best. For large or sprawling events, more than one priority carpool lot may be needed. If your event is close to a major business center, providing priority carpool parking may be more difficult, but it's still important to try to offer it as part of your Car Smart Communities Event Plan. Alternatively, you might seek churches or community institutions whose lots would be attractive places to park and which would not normally be full during the hours of your event. You'll need lots of clear signage to direct carpoolers to your lot.
Sign posts are available at all local lumber yards.
You may want to consider adding a bunch of balloons to each sign to help catch drivers' attention. Remember, though, that although balloons are good attention getters, it's time consuming and expensive to get them filled with helium, and there are environmental concerns if they're released. It's important to try to offer priority carpool parking even if you have to use the honor system. Having a few cell phones to improve communication between these volunteers will really pay off. Volunteers from youth groups may be willing to help, especially if they are provided some small incentive gift for their assistance, such as free admission or free food at the event.