What does it mean to ride across the bridge?

Why don't horses cross the bridge (from Taoism, superstition, etc.) ) also: horses can't cross the bridge, horses can't cross the bridge.

The original text of this sentence is: Get off the horse at every bridge, and the second half of the sentence is a ship crossing Zheng Mo. This is not a Taoist thing, let alone a superstition, but an ancient etiquette to remind you to travel safely. Teacher Li Bingnan, a modern scholar, said in "Li Changliu" that in the past, it was a southern boat and a northern horse, so you should know how to ride a horse in the north. A manned horse is different from a horse in battle. It's untrained. When it sees water, it will drink water. When he reached the bridge, he walked under it and jumped into the water. It's dangerous if the rider is an amateur. So it doesn't matter if the rider dismounts first and leads the horse across the bridge. Some etiquette and customs handed down from ancient times in China are based on the ancestors' concern and care for their children and grandchildren. Today's lifestyle changes may not be needed, but we must observe their intentions and be grateful, and then apply them to real life. Don't reject what our ancestors preached, refuse to think deeply, and just think that you are superstitious, then you are really lost.