

The routes themselves are bad. The tunnels run below already existing state highways. It saves them admin time only having to get approval from the agency that manages the highways, but makes it a poor choice for a transit line.
A conversion could be useful for getting people to the city center from the airport. But any station along the route would be difficult to access, unpleasant to be in, and be of little use to anyone being buried under a highway.










Km/h is correct. KPH is wrong.
Mi/h is wrong. MPH is right.
Someone got confused and used the wrong form of abbreviation for speeds. KPH stands for Kilometers per Hour, and is a sign of a lack of proofreading. Yes I am also bothered.