It's the other way round for me. Part of my route to work is a route to the coast. All through the summer holidays, it's a caravan procession. You can guarantee it'll be stationary or crawling on Friday and Sunday afternoons.
Cycling along it isn't too much of a problem - it's joining it that is. You get inland-bound traffic (on a Sunday) going at maybe 20mph, all perhaps 2m apart, in one lane, and coast-bound traffic bombing through the junction at 60 in the other. The crawling drivers helpfully wait to let you cross when there's not the faintest chance of safely joining the other lane, or blithely ignore you when a gap arrives when you could cross and join. You can't win. (Some drivers get quite uppity when I don't take up their invitation to cross in front of them and throw myself in front of the oncoming traffic in the other lane!)
And then when you're in the moving lane, it's narrowed by the crawling or stationary oncoming traffic and close passes are the order of the day. There've been some near head-ons, too, from drivers using part of the other lane to overtake me, but failing to spot a motorcyclist filtering past the stationary traffic.
The last of the holiday traffic seems to be dissipating at last, though, so we're nearly back to normal.