Why is the speed limit on the Hedong-Dalian Expressway set at 80 kilometers per hour?

[Penny]

The speed limit on the Hedong-Dalian Expressway is set at 80 kilometers per hour only in certain sections, primarily due to technical conditions affecting interchange areas and tunnel sections. The design speed of the Hedong-Dalian Expressway is 100 kilometers per hour, with speed limits of 80 kilometers per hour in areas such as the curved section of the Dongjiagou Interchange and the Jinshan Tunnel. Relevant information about the speed limit is as follows: 1. Introduction to speed limits: Speed limits generally refer to the regulation of vehicle speeds within a certain numerical range over a specified distance of road. 2. Purpose of speed limits: The main purpose is to pre-warn drivers to reasonably control their speed in subsequent sections ahead, prevent the dangers of speeding, and ensure driving safety. Speed limits are an indispensable and most important aspect of road transportation safety.