Final answer:
The sign that indicates a road branching left and straight is the Y-junction sign. It informs drivers about the upcoming split in the road and is essential for safe navigation.
Step-by-step explanation:
The road sign indicating that the road branches left and straight is typically referred to as a Y-junction sign. This type of sign is designed to inform drivers that the road ahead splits into two directions: one veering to the left and the other continuing straight ahead. Road signs, such as the Y-junction sign, help in guiding drivers and ensuring traffic safety by clearly indicating the layout of upcoming roadways. It's important for drivers to understand and follow the instructions provided by these signs to navigate roads and junctions safely.