Final answer:
When a traffic signal displays a red light and a green arrow together, vehicles can cautiously proceed in the direction of the green arrow. The arrow conceptually indicates a protected turn, improving flow and safety for both drivers and pedestrians.
Step-by-step explanation:
At an intersection, if you observe the traffic signal displaying both a red light and a green arrow, this indicates that while you must stop for the red light if intending to go straight or turn left (unless otherwise permitted), you can proceed with caution in the direction the green arrow is pointing.
Typically, a green arrow allows for a protected turn in the direction of the arrow, meaning that the oncoming traffic has a red light and you have the right of way to complete the turn without cross-traffic interference.
In addition to managing vehicle traffic, a traffic light improves pedestrian safety by providing clear signals when it is safe to cross the intersection.
Moreover, the installation of a traffic signal can significantly reduce accidents, since the control it provides over vehicle movement helps to prevent collisions and improve overall traffic flow, especially in high-congestion areas such as near a college or growing business district.