To make things worse for the driver of the parked car, the law in most cases imposes the greatest duty of care on the vehicle that is getting out of the parking area, which means that the driver who is pulling out of the parking area is almost always found at fault, because the upcoming cars have the right of way. The driver who pulls out of the parking area has to do everything in his power to make sure that he merges into the traffic safely and doesn't create any danger to the upcoming traffic.
Thus, if you are completely unable to see the upcoming traffic through the cars that are parked next to yours, you are well advised to actually get out of the car and glance at the street and make sure that the road is clear or even ask the upcoming driver to stop for a moment and let you pull out from the parking area safely.