How safe is olmt for nearby areas?

So i know that the government is gearing for the commercial launch of olmt. Although, i do have concerns over its safety. I mean wouldn’t it have been safer for the nearby residential areas to have an on-ground train system than an overhead one. I have actually seen the track pass from over the area where one of my relatives lives, and it is honestly overwhelming. Plus, i think the country’s experts should push for an underground train network. That could take time, especially money, but it would be a much better infrastructure investment for the long-term. And it would boost the connectivity across a city, that our real estate projects so enthusiastically market.