Overall, I have pretty good semi-rural roads most of my way to work. 26 Miles. I would say 2-3 miles do I feel to be riskier. Most of the roads I travel have wide bike lanes and light traffic.
The two miles. No shoulder to speak of and high traffic.
St Route 79 south, entering Temecula has very high traffic volume as you approach I-15. There is enough room to share with cyclists in the right lane if the motorists chooses to. Luckily, road officials have put in a pedesterian cross walk under the freeway on ramp. With the pederterian 'cross walk' light flashing that is the ONLY way, traffic entering the on ramp WILL stop.
The other one mile is on Winchester Road, St.Route 79 north.... No shoulder and lots of traffic. For just one mile.
22 miles of relative comfortable riding. That is good.
Worst bike maneuveur is negotating traffic and lane crossing at freeway entrances.That is scarry.