Final answer:
A Slow Moving Vehicle sign should be placed on vehicles that travel at less than 40 km/h. A car going 33 m/s is moving at 118.8 km/h and is exceeding a 90 km/h speed limit.
Step-by-step explanation:
A red triangle Slow Moving Vehicle sign should be placed on any vehicle that travels at less than 40 km/h. This is to notify other road users that the vehicle is moving slower than the typical speed flow of traffic and extra caution should be exercised when approaching or overtaking such a vehicle.
To address the question about vehicle speeds, a car traveling at 33 m/s can be converted into kilometers per hour (km/h) by using the conversion factor where 1 m/s is equivalent to 3.6 km/h. Thus, the car's speed becomes 33 m/s * 3.6 km/h per m/s = 118.8 km/h. Therefore, if the speed limit is 90 km/h, the car is indeed exceeding the speed limit.