Photo: Wakial Loop in Phoenix. The stripe was added years ago; I imagine in an attempt to slow through traffic. The road serves as a cut-through for AM rush hour traffic between 48th ST and Warner Rd.
Photo: Though it ought to be self-evident; there is no bike lane here (the hash stripes should be a give-away)... Warner Rd eastbound at 51st St, Phoenix. The shoulder ends just around the bend approaching I-10.
Photo: Remember, not all roads have shoulders, and not all roads with shoulders have paved shoulders. This two-lane highway has a wide, graded, dirt/gravel shoulder. Maricopa Road; near the Wild Horse Pass Casino.
Photo: Knox Rd east of Rural.
This is a designated bike lane.
Most streets with sidewalks have a curb and the sidewalk is raised a few inches. 
This collector street has sidewalks but they're flush with the roadway, and there's no curb, just a kind of flat gutter pan.
One imagines curbs are often necessary to direct stormwater drainage.
Photo: Knox Rd, west of Rural, Tempe. Fairly common collector street configuration. The road is laned, in this case, just with a center line. This road is a "two-lane highway". The lanes are quite wide, perhaps 18 feet, each; however parking is allowed.
The darker car is parked (not particularly well).
When no cars are parked, and no other obstructions, each lane is "wide enough to share" safely, and so bicyclists going slower than the "normal speed of traffic" must ride "as close as practicable" to the right-hand curb.
On the other hand, any parked vehicle narrows the lane to the point where it is clearly not wide enough to share; and 815A4 exception would apply and cyclists can ride anywhere within the right-half of the roadway.
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Ed Beighe
Public
Remember, not all roads have shoulders, and not all roads with shoulders have paved shoulders. This two-lane highway has a wide, graded, dirt/gravel shoulder. Maricopa Road; near the Wild Horse Pass Casino.
no plus ones