Final answer:
A 40 foot truck traveling at 35 MPH should follow the 'three-second rule' to maintain a safe following distance, which equates to about 153 feet or more to react and stop safely in ideal conditions.
Step-by-step explanation:
When driving a 40 foot truck at 35 MPH, it is important to maintain a safe following distance. This is commonly determined by the 'three-second rule,' which suggests that a driver should stay at least three seconds behind any vehicle that is directly in front of the driver's vehicle.
To calculate this space in seconds, you should note when the rear end of the vehicle in front of you passes a stationary object, and then count how long it takes for the front of your vehicle to reach the same object. At 35 MPH, which is approximately 51 feet per second, the distance covered in three seconds would be about 153 feet. This safe following distance allows for adequate time to react and stop if necessary.
The reaction time and braking distance vary depending on several factors such as vehicle size, weight, speed, road conditions, and the driver's attention and physical condition. However, the rule is a good baseline for maintaining a safe driving distance in ideal road and weather conditions.