Skytrain is automated because it is grade-separated and in the air. It is mostly power up and go. Here we have sections with different speeds. SOmeplaces it is 20 km/h. The max speed is 80 km/h. Skytrain does not have to interact with people or cars like the C-train does on 7 Ave. Aside from 7th Ave there are other problems like Snow and cold weather. How will an automated train know about the car that is blocking 7th ave during rush hour? In extreme cold the max posted speed drops from 80 km/h to 60 km/h. When it snows there are a few precautions that train drivers take. Snow and Cold like we get here is not even remotely found in Vancouver. Everyday of the week I have an average of 2 jaywalkers on 7th and a few others at pedestrian crossing at stations like Chinook and Sunnyside where the train has 100% of the right of way. Do you think a computer will see the person making a run for it ? Lastly, 7th Avenue has buses and EMS and police. Most of the time they follow rules of 7th Ave like never to exceeed 40 km/h and only exiting on a right turn at certain streets. Sometimes they don't and there's no way for a computer to react to those things.case in point, C-Train vs Skytrain in Vancouver.
The Skytrain is a completely automated LRT with no human driver on board.