It is out on a country road. I was out there for about an hour this evening and two cars passed. I don't think traffic will be a problem.
Did you scout the location at the same day and time of day you will be shooting? Also check schedules for local events. For example... The location is scouted on Thursday night between 10pm and 11pm. The shoot is scheduled for a Saturday night. The local kids like hot-rodding down that particular piece of road on Saturday nights. Or there's a local bar that's only really busy on the weekends, so the traffic picks up
A LOT on Saturday night. Or there's a motorcycle rally scheduled for that weekend. Oops. Also, have an alternate location. F'r instance; on the night of your shoot there's an major accident on the main highway, and your remote country road is the perfect alternate road for the big rigs.
BTW, I concur with checking with the local authorities; at the least there's the potential for the local constabulary shutting down your shoot, at the worst is a night in a jail cell and confiscated equipment.
Just for fun... I'm a regular, though small, contributor to the Silver Shield Association here in Connecticut; the SSA looks after the families of injured and killed uniformed police. I began contributing when I was performing with a well-known oldies act, we did lots of PBA, SSA and other benefit shows all over the North East and I became friends with lots of cops. My "junk mobile" car has years of SSA and PBA stickers on it. All I get is a polite request to leave places I shouldn't be when I'm out field recording instead of more serious repercussions. Of course, being polite and cooperative when they initially show up doesn't hurt either. In fact, I get a lot of "If anyone asks, I never saw you here."
On more tip for giggles... Don't use the term "shoot" (you're filming) or refer to a mic as a "shotgun" (it's a "lobar" mic) when filming in Washington D.C. or you're anywhere near politicians; you'll have Secret Service or State Police all over you!