I love this sign. See it all the time. "Cyclists in the driving lane". It is usually posted when there new segregated bike lanes are being built and the cyclists are redirected into traffic. Don't worry. It's not dangerous. We're used to it, motorists and cyclists alike.
I like the tone. There are cyclists in the driving lane. Period. Adjust accordingly to this fact.
A bike sticker. "This is too wild." Indeed.