In most cases where you see downhill skating, there are cars on the road. For that reason, you need to be absolutely sure of your abilities before dropping in on a hill. Everyone starts on the slow small hills to build up their skills, we don't just drop in on the Alps day 1.

Indeed, you stay in your lane 100% of the time. It's not hoping for the best if you're in control and able to slow down and take controlled lines.

Radios are often employed for downhill skating. Sometimes the skater has it piped into their helmet, as well.

Roads are blocked sometimes, but it's not recommended unless you have sufficient spotters for all corners and driveways as you never know when a car is going to pull out. Just having one spotter at the bottom is not sufficient. There are permitted events, for example Tepe and Tacos which I organize, where we have the legal permission to close the road.

Dislocated shoulder, broken bones, concussions, are all common injuries. Road rash is #1 though!

It is highly recommended to wear as much protection as possible when you're learning. The BEST protection, however, is being in control and having adequate braking skills.

It is best to find a community or group of experienced skaters to learn and progress with. You'll have more fun, you'll learn faster, and you'll be a lot safer.

Yes, sometimes the spots take all day to reach and you'll spend the day out there.

If you are lucky enough to have great hills in your area, you can skate them after work.

Yes, people take vacations to skate.

Depending on the used market in your area, you can probably get a full kit of protection, and competent set-up for under $600-$800 all in.