What does the green channel mean? Why is it called the green channel?

The green channel, that is, the green light, refers to providing convenient through train service for large enterprises and major projects, including non-real estate projects invested and built by enterprises listed in the list of large enterprises enjoying convenient through train service announced by the municipal government; Emergency construction projects and major construction projects determined by the municipal government; High-tech construction projects recognized by the state, Guangdong Province and XX City. General projects do not enjoy convenient through train service.