Final answer:
When you see a road sign with an arrow pointing left and the word 'ONLY' below, your only legal maneuver is to turn left. No other actions, such as going straight or turning right, are permitted from this lane, ensuring safety and traffic flow.
Step-by-step explanation:
If you are traveling in a lane marked with an arrow pointing left and the word "ONLY" painted beneath it, the correct and legal maneuver you may make is to turn left. This indication is a type of road signage that helps drivers understand permitted maneuvers at a particular junction or stretch of road. Since the word "only" follows the arrow, this exclusively denotes that a left turn must be made and no other maneuver such as turning right, going straight, or reversing is allowed in this lane. Other lanes may be designated for different directions or actions. It's important to follow these directions to ensure safety and the smooth flow of traffic.