Meanings of massive ramp in English

What is the reason for the massive ramp up under stage 2?

Even the levels are nicely laid out, including a school, massive ramp in the desert and downtown LA.

For one, the State isn't building these homes, the private sector is, which makes a nonsense of politicians promising massive ramp-ups in construction.

With a massive ramp-up in security operations came the need for organizations that could move quickly to implement new rules, regulations and screening protocols.