Final answer:
Drivers should turn left at an intersection only when traffic is clear without a left arrow signal, ensuring safety for all road users.
Step-by-step explanation:
When dealing with an intersection where the left arrow doesn't illuminate, drivers should turn left only when traffic is clear in both directions. This means being vigilant and taking the time to ensure that the way is clear of oncoming traffic, as well as ensuring that there are no pedestrians crossing the street. Traffic signals play a crucial role in controlling traffic flow and providing safe crossing opportunities for pedestrians. In the absence of a green left turn arrow, patience and adherence to the rules of the road are essential for traffic safety and preventing accidents.