高速为什么超出24小时还没收费？

中文段落：

高速公路作为现代交通的重要组成部分，对于促进区域经济发展、提升交通运输效率具有重要意义。然而，有时我们会发现，即使车辆在高速公路上行驶超过24小时，却仍未被收取通行费。这是为什么呢？

首先，高速公路的收费系统通常是基于车辆通过收费站的时间来计算的。如果车辆在通过收费站后24小时内没有再次通过收费站，那么系统就不会对其进行收费。此外，一些高速公路可能采用分段计费的方式，即根据车辆行驶的路段和距离来收取费用。在这种情况下，如果车辆行驶的距离较短，可能就不会产生额外的通行费用。

其次，高速公路的收费政策可能因地区而异。在一些地区，为了鼓励公众使用高速公路，可能会实施免费通行的政策。此外，一些高速公路在特定的时间段内也可能实行免费通行，例如在节假日或夜间。

综上所述，高速公路超出24小时未收费的原因可能包括收费系统的计算方式、分段计费方式以及地区收费政策等因素。对于驾驶者来说，了解这些原因有助于更好地规划行程和预算费用。

英文段落：

As a crucial part of modern transportation, expressways play a significant role in promoting regional economic development and enhancing transportation efficiency. However, sometimes we may observe that even if a vehicle has been driving on an expressway for over 24 hours, it has not been charged for the toll. Why is that?

Firstly, the toll collection system on expressways is typically calculated based on the time a vehicle passes through a toll station. If a vehicle does not pass through another toll station within 24 hours after passing the initial one, the system will not charge it. Additionally, some expressways may adopt a segmented pricing approach, charging fees based on the road sections and distances traveled by the vehicle. In such cases, if the vehicle travels a relatively short distance, it may not incur additional toll charges.

Secondly, toll policies on expressways can vary by region. In some areas, to encourage public use of expressways, free toll policies may be implemented. Furthermore, certain expressways may offer free tolls during specific time periods, such as holidays or overnight.

In conclusion, the reasons why an expressway has not charged tolls after 24 hours may include the calculation method of the toll collection system, segmented pricing, and regional toll policies. Understanding these reasons can help drivers better plan their trips and budget their expenses.