This sign signifies that you are on a bike path. This sign comes in both engineering and high intensity grade reflectiveness.
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MUTCD Section 9B.19 Bicycle Route Guide Signs (D11-1) Guidance: If used, Bicycle Route Guide (D11-1) signs (see Figure 9B-4 of the MUTCD) should be provided at decision points along designated bicycle routes, including signs to inform bicyclists of bicycle route direction changes and confirmation signs for route direction, distance, and destination. If used, Bicycle Route Guide signs should be repeated at regular intervals so that bicyclists entering from side streets will have an opportunity to know that they are on a bicycle route. Similar guide signing should be used for shared roadways with intermediate signs placed for bicyclist guidance.