Jakarta commuter Irnawati can spend up to four hours daily in her car, but now she and millions of others may get some relief as the traffic-clogged Southeast Asian city opens its first mass rapid-transit (MRT) system.Today, Jakarta will inaugurate the US$1.1 billion project seen as crucial to tackling some of the world's worst congestion, which can turn commutes into hours-long endurance tests.For Irnawati, the new line means she might now be able to move back to her suburban home on th