JJ Keller Entry Level Driver Training for CDL (Commercial Driver’s License) Practice Test

When emergency warning devices are placed ten feet behind and one hundred feet in front of a truck, it indicates a specific signaling pattern that is typically used on two-lane roads. This type of roadway configuration allows sufficient space for oncoming traffic to be alerted to a stopped vehicle, particularly in scenarios where the visibility may be limited, such as in curves or hills. The larger distance in front of the truck ensures that approaching drivers have ample warning to slow down and maneuver safely, while the shorter distance behind might be used to alert vehicles coming from the rear.

On multi-lane highways, the placement of warning devices usually requires greater distances due to higher speeds and the complexity of lane changes. One-way streets would not necessitate this particular setup as the traffic flow is linear and more predictable. Private roads often have less stringent requirements for emergency signaling since they may not experience the same volume of traffic or different types of road users. Therefore, the specific distances indicated in the question point to a two-lane road scenario where awareness and caution are paramount for both oncoming and following traffic.