78 Escondido -> Ramona
It's the shortest route from point A to point B, but I've always had reservations about safety of this route. After seeing that there's a fairly well-traveled segment on Strava, I've decided to go and check it out.
There's no shoulder for about half of the distance. Cars keep coming more or less non-stop, maybe 1 car per minute. Passing is prohibited (double solid yellow lane almost all the way.) When I saw other cars coming and I couldn't ride on the shoulder, I had to stop and dismount. In the end, my attempt looked like this
The whole route took about 30 min. less than my standard route via Ysabel Creek -> Bandy Canyon -> Highland Valley, but I'd describe it as "barely tolerable" and I don't want to do that again, at least not with this much traffic.
The attempt placed me dead last on the leaderboard for the Strava segment. Looking at other people's attempts, I see that the vast majority of them rode up the hill without stopping or sometimes with one stop. I have no idea how they do that. Either I'm missing something or they all have a death wish.
From Ramona, went to Santa Ysabel and Mesa Grande. As usual, did not see a single cyclist in either direction. On Mesa Grande, there were almost no cars, either.