What is the maximum allowable height of a vehicle on a highway?

Answer: A — 4.15 metres

The maximum allowable height of a vehicle on a highway is 4.15 metres. This is determined by various factors such as overpasses, tunnels, and bridges that the vehicle may encounter on the highway. Option B, 3.5 metres, is too low and may not account for these potential height restrictions. Options C and D, 5 metres and 2.95 metres respectively, are also outside of the standard height for most highways and would not be a safe or practical maximum height. It is important for drivers to be aware of the maximum height limits in order to avoid potential accidents or damage to their vehicles.