Fairfax County installed the "no parking" signs in the RPPD area and have started policing the area. This program is designed to protect our streets from commuter parking but appears to have developed some initial concerns about how to attain parking decals for residents' vehicles.
If you are in the affected area, you should have got a letter in the mail from Fairfax County. They sent them to all of the homes affected by the new parking restrictions. When you get the letter, it has directions for how to apply for the permits online. Permits arrive in the mail about a week later. If you did not get a letter, Fairfax County Department of Transportation's number is (703) 877-5600.
Details about the RPPD program can be found here: www.fairfaxcounty.gov/fcdot/rppd.htm
Instructions on how to apply for a permit are available online at www.fairfaxcounty.gov/fcdot/rppdwebform.htm. The process is fairly simple and the decals and visitor permit arrive in just a few days.
You can find the vehicle property tax number at www.fairfaxcounty.gov/dta/epay
Although the RPPD FAQ states that you don't need a permit to park in the driveway, it's probably safer to apply and get the resident and visitor permits.