Lyric discussion by stretch 

Cover art for Caution lyrics by Bob Marley and the Wailers

"Written after Planno was stopped by the police for driving Bob's car without a full license; Bob was held in prison overnight for aiding and abetting his friend. But the line "Caution, the road is wet" is a metaphor, for the conditions of the struggle. Watch your step, says Bob."

Nice Additional context! I always love knowing the life events that inspired a great song like this.