What does a red traffic signal indicate to drivers?

A red traffic signal indicates to drivers that they must stop and wait behind the stop line. This rule is a fundamental traffic regulation designed to ensure safety at intersections. When a traffic signal is red, it communicates to drivers that their passage is not permitted, thereby preventing potential collisions with cross traffic that has the right of way.

It is essential for drivers to abide by this signal to maintain order and safety on the roads. Stopping at a red light allows for pedestrians to cross safely and gives vehicles from intersecting paths a chance to move, preventing possible accidents.

The other options do not reflect the correct action required under a red light. Proceeding with caution would imply that there is some leeway to continue driving, which could lead to dangerous situations. Preparing to turn does not apply unless the specific traffic signal indicates a turn is permissible, often indicated by a separate signal. Speeding up to clear the intersection contradicts the basic rule of stopping at a red light, which could result in severe consequences for both the driver and other road users.