Final answer:
The ideal driving speed should be determined according to road and weather conditions for safety reasons, not just the posted speed limit or the speed of the vehicle in front. Option c.
Step-by-step explanation:
When determining what speed to travel at, you should consider more than just the speed limit or the speed of other vehicles. The optimal driving speed is according to road and weather conditions. This is because the road and weather can affect your ability to control the vehicle and stop in time to avoid accidents.
For example, in towns and cities, the speed limit may be 60 km/hr; however, if it's raining or if the road is congested, you should adjust your speed to ensure safety.
Additionally, external factors such as visibility can dramatically affect safe driving speeds. In scenarios where visibility is poor, it's crucial to slow down and not simply follow the speed at which other vehicles are traveling or assume the posted speed limit is appropriate.
So, the color of your car does not impact the speed you should be traveling at; it's the environmental and traffic conditions that dictate the appropriate speed for safety.
Remember that while driving, making sure you're able to stop safely is critical. This means that if a pedestrian needs to cross the road, they should have enough time to walk at least 4 meters, considering the length and width of an average car, before the car reaches them.
Planning your route in advance and giving yourself enough time to reach your destination can help in maintaining a safe and consistent speed without the need to rush, thus reducing the urge to speed or ignore road conditions.
So Option c.