"But these are shark infested waters!"
"I don't see why you're complaining. We've laid down a white stripe to indicate a swimming lane. You'll be perfectly safe."
"These seats seems awfully close to the NASCAR track."
"But these white lines means you're in a spectator safety lane. It'll be fine"
"Hey, is that a vial of flesh-eating bacteria?"
"Yeah, but it's on the other side of this white line. We're in the non-infectious lane. Why worry?"
"Our zoo has sure saved a lot of money by replacing the lion cages with some white paint and zoo visitor lanes"
"But Marcus, Vesuvius!-"
"Never you mind. We're in the safe-from-ash-and-magma lane. No worries."
"By covering Whitechapel with these carefully painted white lines, the Ripper will be rendered completely ineffectual!"
"DANGER: RADIOACTIVE. Unless, of course, you're on the other sign of that white stripe"
Bike lanes are just white stripes. Never forget.