Drivers in Park Slope, Brooklyn say parking there is a nightmare and they sometimes have to circle for hours looking for a spot, and all the cars looking for spots increases traffic.The advocacy group Transportation Alternatives conducted a survey that found 45 percent of the traffic and 64 percent of the local traffic are just cruising for spots. They also found that one in six cars is parked illegally and curb saturation is nearly 100 percent."Tuesday is the worst day to park in Park Slope, says a resident. I drop my kids off every morning. We leave at this time and I come back and circle for two hours, and I never can find a parking spot.""We'd like Park Slope to become a pilot parking improvement district, as they're called, where you apply market forces and market principles to scarce parking to free up more curbside space, enable more efficient delivery and get rid of a lot of the unnecessary traffic, said Paul Whyte of Transportation Alternatives.Some of Transportation Alternatives' solutions include starting a locally-managed parking improvement district, raising the price of curbside parking at meters and giving out residential parking permits on side streets to reduce cruising.