Final answer:
The safest option when needing to avoid a car ahead while another car is beside you in the left lane is to slow down and let the car beside you pass, then change lanes if necessary, always prioritizing safety and caution.
Step-by-step explanation:
If there is a car beside you in the left lane and you need to avoid a car ahead, the safest option is to slow down and let the car beside you pass. This allows you to then change lanes safely if needed, without the risk of collision with the car in the left lane. It is important to always maintain a safe following distance and adjust your speed accordingly to avoid sudden braking, which can lead to accidents.
In driving, it is crucial to make decisions that ensure safety for all road users. Sudden actions like braking suddenly can be dangerous and cause collisions, especially if there isn't adequate space for the maneuver. Moreover, choosing to speed up and overtake the car ahead can be risky if you do not have a clear view of the traffic situation ahead. Always prioritize safety and caution when behind the wheel.