To battle increased congestion in the downtown area a mass transit plan was introduced. Bus lines were added to all avenues within the Perimeter Freeway, running either east-west or north-south. In addition to this basic mass transit the Mojave infrastructure board decided on building a network of BRTs running on their own grade separated highways.
The western parts of the yellow line (University of Southern California Mojave City-Northwest downtown) and the green line (Millers Valley Ranch-Northwest downtown) were the first to open as the suburbs they run through were not yet finished, why it could easily be added without use of eminent domain.
The Eastern part of the yellow line and the souther part of the green line were a bit more complicated, having to be built elevated for some parts, and with pretty tight curves.
The green line carries 102 000 passengers every day, of which the majority (76 000) travel between the 670 000 residents government housing complex near the southern terminus of the line and the downtown area. This 8 mile (13km) trip takes approximately 12 minutes, with about twice that for the entire lengt.
The yellow line has a total of approximately 25 000 passengers, of which 16000 step of downtown, 4000 at the USCMC and 2000 at the southestern terminus. The whole line end to end is 12 miles/22km, taking about 25 minutes depending on the number of moms trying to haul strollers onto the buses.
The Orange line is today nothing but a 1/2 mile stump going north from the central bus station, with a total ridership of 2700. Construction was planned to begin 2027, but the unexpected succes of the green line means there's simply no capacity left on the part that it already shares with the yellow line, why construction has been delayed until at least 2029 while a new alignment is being worked out.
The red line Metro (also called Millenium Park Metro line) is the only "real" subway line is the city. It's used way below capacity at only 25 000 passengers per day, and is not expected to see an increase in ridership unless it gets an extension north of the mountains or southwest to the Corall Reef. Any extension is unlikely the coming 10 years as development downtown has come to a stop.
The purple line (often called the "why the hell does it exist line") is a 1 1/2 mile line crossing the red line at the central station. It currently fills no purpose, but still operates with 15 minuts traffic for its 1400 daily riders. Some day it is supposed to be extended north of the mountains and south to the Stadiums. Pending Funding.