Final answer:
If you see a sign with an arrow and the word 'only' below it, you should follow the direction indicated by the arrow. Not following the sign's instructions could result in traffic violations and unsafe driving conditions.
Step-by-step explanation:
When seeing a sign over your lane with an arrow and the word "only" below it, you should follow the direction indicated by the arrow. This means if the arrow points left, you must turn left; if it points right, you must turn right; and if it is a straight arrow, you must continue straight ahead.
Ignoring the sign and continuing straight when the arrow indicates a turn, changing lanes immediately, or stopping and waiting for further instructions are not correct actions according to traffic laws and road sign instructions.