Why does the fifth gear automatically disengage on the highway?

[StEmily]

Here are the reasons why the fifth gear automatically disengages on the highway: 1. High-speed gear disengagement: High-speed gear disengagement refers to the automatic shift of the transmission from a high gear back to neutral while the car is moving. 2. Reasons: Due to long-term wear on the engaging bodies of the inertia lock ring or the synchronizer cone ring and the internal engaging teeth on the sliding sleeve, a conical shape is formed, thereby generating axial thrust on the engaging teeth. At high speeds, when this thrust exceeds the locking force of the gear spring, gear disengagement occurs. Here is extended information on specific policies for free highway passage: 1. Regulations: According to the "Implementation Plan for Exempting Toll Fees for Small Passenger Vehicles During Major Holidays," the free passage period covers four national statutory holidays—Spring Festival, Tomb-Sweeping Day, Labor Day, and National Day—as well as the consecutive rest days of these statutory holidays as determined by documents from the General Office of the State Council in the current year. 2. Free period: The free period starts at 00:00 on the first day of the holiday and ends at 24:00 on the last day of the holiday.