The bottom line is that your connecting road system has been designed in a pedestrian-hostile, bicyclist-hostile, and arguably motorist-hostile fashion which endangers everyone. In California, the default speed limit is also 55mph / 90kph, and undivided rural shoulderless 2-lane roads are by far the most dangerous anywhere. In San Diego County, a similar 1-mile segment of road, Via de la Valle west of El Camino Real, was recently augmented with bike lanes. I do not want to get into a bike lane fight here, but just having the extra width was a huge boon to all road users. Predictably, a local politician complained loudly about the $1M price tag for the road improvement, but I responded with my own letter to the editor, noting that good road shoulders enhance safety for everyone, not just bicyclists.
I'll be perfectly frank -- I am an experienced cyclist who also tends to be timid, and I would have reservations about using a high-speed shoulderless two-lane highway in which motorists could pass me only by moving into opposing traffic at a 100+mph closing speed.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069