Hello the slow guy and All,
Was that a troll?
Middle of lane vs. bike lane (21208) or California CVC 21202
(a) Any person operating a bicycle upon a roadway at a speed less than the normal speed of traffic moving in the same direction at that time 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, vehicles, bicycles, pedestrians, animals, surface hazards, or substandard width lanes) that make it unsafe to continue along the right-hand curb or edge, subject to the provisions of Section 21656. For purposes of this section, a “substandard width lane†is a lane that is too narrow for a bicycle and a vehicle to travel safely side by side within the lane.
(4) When approaching a place where a right turn is authorized.
(b) Any person operating a bicycle upon a roadway of a highway, which highway carries traffic in one direction only and has two or more marked traffic lanes, may ride as near the left-hand curb or edge of that roadway as practicable.
http://www.calbike.org/bicycling_in_california_sharing_the_road
And perhaps add context to those laws with League of American Bicyclists report:
http://bikeleague.org/sites/default/files/EBC_report_final.pdf
Excerpt:
For example, the most common collision type in our Every Bicyclist Counts data is a rear end collision. Approximately 40% of fatalities in our data with reported collision types were rear end collisions. This is higher than what was found in the 2010 FARS release that included PBCAT-based crash types (27% of fatal crashes with reported collision types), although the crash type “motorist overtaking bicyclist†was the most common collision type in that data as well.
Also DOT statistics show motorist** **rear end collisions as largest type of motorist to motorist crash … and note that motor vehicles are a larger target than cyclists … and I think there are something
https://www.nhtsa.gov/risky-driving/distracted-driving
http://i59.tinypic.com/2jfdojo.jpg
The cyclist’s choice to ride in the center of the travel lane usually resides in evaluating volume and speed of motorist traffic when other alternatives are not available.

Unfortunately … if you observe cyclists they seldom actually look behind them … and WTC and ITU rules now prohibit mirrors and restrict a cyclist’s situational awareness in an attempt to prevent cheating by making it difficult for cyclists to observe traffic behind them.
Motorists largest class of crashes is rear end crashes … not encouraging when taking the lane.
http://www-nrd.nhtsa.dot.gov/Pubs/812032.pdf
Page 70 Table 29 Reported rear end motor vehicle traffic crashes each year in US: … 1,847,000 …. That is 5,060 rear end crashes each day in the US … the largest class of crashes … but motorists have about another 10,000 crashes each day of other kinds … be wary when a motorist is behind you.
Make safe choices … Stay alert … stay safe.