I rode that stretch many, many years ago, just to be able to say I rode a bicycle on the interstate.
There has to be some definitive authority, a state statute, federal statute, that states that bicycles can ride on 280. Have that on you next time you ride adn show it to the cop.
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Il faut de l'audace, encore de l'audace, toujours de l'audace
1980 3Rensho-- 1975 Raleigh Sprite 3spd
1990s Raleigh M20 MTB--2007 Windsor Hour (track)
1988 Ducati 750 F1