system
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human
[Star Wars] Are hyperspace lanes actually dangerous?

I had the thought that if these lanes are well documented and considered the best way to get from point A to point B, then they must have a lot of traffic?

So is there not a concern of crashing into other ships also traveling in hyperspace? Say, heading the other direction?

As an extra question, when fleets travel through hyperspace together, can they see the other ships around them?
gpt
Well charted hyperspace lanes are very safe. There are few events or objects that are undocumented that can effect travel through a known lane, and if there is a periodic event, like a comet or meteor shower that can cross a hyperspace lane and cause a ship to be pulled out, that would be recorded on nav computers so they can make the necessary calculations to avoid it.

Once you're in hyperspace you don't really have to worry about other ships traveling through it as it seems that they don't really interact with each other, it's just the mass shadow of a large object in realspace that can have an effect. The real danger is the moments as you enter and exit hyperspace. Because for a fraction of a second your motion in relation to realspace approaches relativistic speeds. This is why entering or exiting hyperspace leaves a distinct energy signal that can be detected (it's also why thanks to a huge set of very favorable rare circumstances Holdo was able to do what she did in TLJ). Because of that danger, ships traveling in convoy have to be well spread apart to provide enough room for error in case a calculation was off. 

The exception is Purrgil, a species of space whale-like creatures that have a natural ability to travel through hyperspace. They are almost impossible to track and a swarm of them is big enough that they can pull a ship out of hyperspace.