To drop off a passenger in front of Terminal 1, use the R132, make a left onto the new road taking you past the new T2 to T1.
If you pick up a passenger, you need to park in the short-term parking area.

Parking options at Dublin Airport are available in 3,600 short-term and 14,400 long-term spaces:
1..Short-term Carparks A & C are across from Terminal 1, which can be reached from R132 Old Airport Road.
2. Short-term multi-level carpark is across from new Terminal 2.
3. Long-term Blue Carpark has its entrance on R108, while the
4. Long-Term Red Carpark is off R32.

Long-term parking Blue & Red are served by a free shuttle bus running every 10-20 mins.

Payment:  Automatic pay stations are in both terminals 1 & 2 and at the entrance to short-term and muli-level carparks; credit cards are accepted at all pay stations. 
Pay stations are at the entrance and beside the elevators in both short-term carparks accepting cash, credit card or laser card.
Other pay stations are n the Coach /Surface carpark and long-term red carpark.  When paying in cash, use one of these pay stations.  For assistance at ay barrier or pay station press the i button.

For more parking information call within Ireland 1-800-204-010; outside Ireland +343 1 814 4828

GPS Coordinates:
Short Term A: 53.42740, -6.24140;  Short Term C: 53.42891, -6.24254;  Terminal 2 Short Term: 53.42700, -6.23885;  Long Term Red: 53.42335, -6.22923;  Long Term Blue: 53.41937, -6.27648

Short Term Parking

Available directly opposite the terminal building. Follow the signposts for Short-term parking, staying to the right lanes as you near the parking area. Remember where you parked your car (lot and level).

Rates:
First 30 Mins: € 1.50
First 1 hr: € 3
Each 1 Hr: € 4.50
Daily max (24hrs): € 40

Executive

Collinstown Executive Car Park is located on the ground floor of the Short-Term B Car Park, and ideally suited for the business traveler. It is adjacent to the main passenger terminal and features a dedicated entrance and exit with vehicle licence plate recognition, thereby offering greater speed and convenience. Parking in the Collinstown Executive Car Park is by membership only. Permits cost €5,000 (ex VAT) per year and are issued on a permit per car basis. For further information, contact Barbara Traynor, DAA Car Parks Administration Supervisor on (01) 814 5438 or email barbara.traynor@daa.ie.

Valet

Valet service is provided by Crystal Clean, located within Block A of the short-term multi-story car park. Drop your car off at their depot and head straight to arrivals / departures - 100 meters from their premises. For valet parking & rates call + 353 87 7782281. For car wash/detailing, call 1800 204010 (within Ireland) or +353 1 8144828 (outside Ireland).

Long Term Parking

Located along the east perimeter of the airport. Follow the signposts for Long-Term parking. A free shuttle bus runs continuously between the terminal building and Long-term parking. Note: remember the parking zone where you parked your car and hold on to your parking ticket! The parking fee must be paid at one of the pay stations located either in the Arrivals terminal, or directly outside the Arrivals terminal at the entrance to the Short-Term parking area. Passengers who have paid their parking fee should return to the Long-Term Car Park on the free shuttle bus.

Rates:
Daily max (24hrs): € 9.50

As an alternative to on-site parking, there are off-airport parking at Dublin airport options which may offer significant discounts. Most have shuttle vans or buses which operate from their facilities to the terminals, and feature secure facilities with security guards and cameras 24 hours.

Many local hotels offer up to 2 weeks free parking with one night stay. This can be especially convenient if you have an early flight and need to park at Dublin airport. They provide shuttle service too.

Nothing is more frustrating than circling an airport parking lot looking for space when you're already running late for a flight or paying an exorbitant amount for parking when you return from a trip. You can avoid these common predicaments by doing your homework before leaving to park your vehicle at the airport.

Most airports offer multiple parking lots at various rates (hourly, daily and economy). Some airports even offer costly, but convenient valet parking. Visit the airport website or call the airport to determine the location and rates for each type of parking garage or service. During peak travel times, it's also prudent to check the short-term and long-term parking lot availability before leaving for the airport, so you can make other arrangements if lots are full. Parking in a daily garage (short-term parking) instead of an economy (long-term parking) lot for multiple days will burn a big hole in your wallet.

You’ll find commercial off-site parking lots near most major airports. These parking lots are farther from the airport, but the distance is often compensated with lower prices, 24-hour security, car-to-terminal shuttle services and other perks like frequent parker programs. Aside from off-site commercial parking lots allow you to reserve a parking spot in advance, which can be a real timesaver during peak travel times. In addition, many airport hotels offer stay, park and fly deals in which you stay at the hotel the night before your flight and then you can park your car at the hotel for free or a low daily rate. Just make sure the hotel parking lot is secure as some aren’t monitored around-the-clock like airport and commercial lots.

It’s too easy to forget where you parked or where you put the parking ticket after an extended trip. Even if you’re running late, take the time to note where you parked in your cell phone, PDA or on the parking ticket if you take it with you. Just make sure you don’t lose the parking ticket, because most airports charge a hefty fee for missing tickets. For that reason, it may be safer to leave the ticket in your car.