Is it true that a driver may go straight or turn left on a green circular traffic light if there is no sign for an unprotected left turn?

The situation described in the question refers to the rules governing intersections with green circular traffic lights. When a green circular light is illuminated, it typically means that vehicles may proceed with caution. This includes going straight or making a turn, as long as there are no specific prohibitory signs present. However, for unprotected left turns, drivers must be particularly careful. While it is true that a driver may have the option to turn left or go straight, the key aspect is the need for caution regarding oncoming traffic and the overall safety of executing a left turn.

The statement indicates that if there is no sign indicating the rules for unprotected left turns, it does not necessarily mean that a left turn is allowed without caution; rather, the driver must ensure the intersection is safe for such a maneuver. This further reinforces the understanding that while green lights signal the right to proceed, they do not eliminate the obligation to yield to other vehicles or pedestrians present, especially in the case of left turns that have not been designated as protected.

In essence, the rules of the road allow for movement under a green signal, but they are accompanied by the broader context of road safety and awareness of surroundings, particularly when making turns that might conflict with other traffic movements.