Geometry

Question Analysis
This question involves calculating the probability of mutually exclusive events within the context of traffic flow.
The main focus is on recognizing that a vehicle cannot turn left and go straight at the same time, making these two events mutually exclusive.
Then, applying the addition rule for mutually exclusive events, , to find the probability of a vehicle either turning left or going straight.

Key Concept Explanation
Mutually exclusive events are events that cannot occur simultaneously.
For mutually exclusive events and , the probability of either or happening is the sum of their individual probabilities because there is no overlap between the events ().

Step - by - Step Solution
Identify the probability of event (vehicle turns left):

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