I also believe that in some states, there actually is a 'FRAP' rules for cyclists - I.e. they must be as far right as possible, meaning it could be illegal for them to be in primary unless given 'permission'.
Our system may well be better in that respect.
This is what many US drivers think. Actually, the Federal Uniform Vehicle Code is:
§ 11-1205 Position on roadway
(a) Any person operating a bicycle or a moped upon a roadway at less than the normal speed of traffic at the time and place and under the conditions then existing shall ride
as close as practicable to the right-hand curb or edge of the roadway except under any of the following situations:
1. When overtaking and passing another bicycle or vehicle proceeding in the same direction.
2. When preparing for a left turn at an intersection or into a private road or driveway.
3. When reasonably necessary to avoid conditions including but not limited to: fixed or moving objects; parked or moving vehicles; bicycles; pedestrians; animals; surface hazards; or substandard width lanes that make it unsafe to continue along the right-hand curb or edge.
For purposes of this section, a "substandard width lane" is a lane that is too narrow for a bicycle and a motor vehicle to travel safely side by side within the lane.
4. When riding in the right-turn-only lane.
Thsi wording has been pretty much adopted, with only minor variations, by all states. So the situation is pretty much the same, in practice, as over on this side of the pond.
Reactions to cyclists, by the US public in letters to newspapers, seem to be vitriolic at a different order of magnitude to those in or own media. As I'm sure Ian cooper will confirm