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You can't park for free in some streets during Sanfermin. Pamplona is easy to get round by foot and during Sanfermin fiestas the public bus service works all day and all night.
Maybe if you have been at Sanfermin fiestas before, you should bear in mind that from 2013, during the fiesta days between the 6th and 14th of July, the blue zone is functioning and it is necessary to pay to park vehicles in the street. In addition, it is no longer possible to park on the sidewalks.
Bearing this information in mind, there are three possible options for parking a vehicle: use a parking lot (under the bullring, under the main square, at the hospital parking lots, Carlos III and other similar payment parking lots. The advantage is that these areas are pretty safe and secure although a bit more expense than Street parking. Sleeping in the vehicles could be prohibited in these areas. A second possibility is to pay to park in the street (blue zone areas from the 6th to the 14th of July, a toll of 8, 70 euros-) thirdly; there are free parking areas in the outskirts areas of the city in what might be called "deterrent parking areas".
These can be found in neighborhoods such as Lezkairu, Buztintxuri, Rochapea or San Jorge. There is easy access to the downtown area of the city thanks to an efficient urban bus service. Walking the distance to the city center is another manageable option. Really, the term "far" is pretty relative, especially in a small city like Pamplona and what is "far" for some is a "short walk" for others. A handy piece of advice: make sure you write down or remember, by some means or other, the name of the street where you have parked. The name on the sign will appear in both Spanish and Basque language. "Calle" and "Kalea", both mean street. (no joke, it happens every year)
In addition, due to the fact that there are events taking place all around the city, there can also be many temporary restrictions imposed on vehicle traffic in different areas. Then some areas only have parking space for the residents of that zone. This is especially true of the inner city areas. Green lines on the pavements indicate that parking is only for residents.
if you attempt to return to you parked vehicle and find that it is missing, it is more likely that the towaway truck has taken it off to the pound than to find that someone has stolen it. If you suspect the former case has occurred, you should call the phone number: 948 17 40 00 (24 hours) to check to see if it is in the car municipal vehicle pound and if so, get 80 euros ready to bring it to the pound to have your vehicle released. You can check here to see if your vehicle has been towed away by municipal police.
The compound is the near of the police station, in the Audiencia Parking, and there is a cashpoint at the door. Be quick, for each day the car sleeps there, you will have to pay a further than 8 euro. No matter how much of a fuss you make, the guards in the office are staunch and you won't get your car back until you pay.
Just one thing: in addition to the 80€ for the truck service (more or less), which you have to pay, they might try to make you pay the fine. You do not have to do this when you leave, you will see. However, foreigners cannot remove their vehicles without paying.
1-. Mobile homes cannot park inside the city areas and they must use the provisional parking lots set up in the outlying areas of the city. Fines are higher for these vehicles than for cars so it is worth taking the trouble to find an adequate parking place for this type of vehicle.
2-. Loading and unloading zones. Each day during fiestas the bars are busy restocking after the previous day and night's drinking. Areas for loading and unloading stock are zealously supervised by the local police. Bear in mind too, that the harassed distributors are particularly impatient during these days of strenuous work and not ready to tolerate obstructions. To recognize these loading areas, check the vertical signs that will be on view in these places with their corresponding time schedules.
3-. Green zone. Some areas within the old quarter of the city will have pay parking during some hours of the day and the rest of the day only for neighborhood residents. Be careful as parking here could mean having the vehicle towed away and the corresponding fine being imposed.
4-. No parking is allowed on the sidewalks, even if you see some other vehicles being parked in this way. Sooner or later the towaway truck will arrive and the fine will be imposed.