It was very easy to get hikari parking because it is very close to the Narita tool gate.

When I used the Hikari parking last time, there was very heavy traffic jam on the highway.
It looked impossible to get airport on time. But, I called to the Hikari parking, and they were waiting for my coming in front of the parking lot. They took us to the airport after I got the parking, finally I managed to take the plane.

I had used another parking lot, but I paid additional fee. Hikari parking does not charge any additional fee, so that I highly recommend this parking lot.