I have been waiting for this particular feature on google map, since the start of pinhole application by google which i think in early 2000. What's the benefit of this feature? Well, apart from traffic update (which i assume is the latest traffic condition update), this dataset feature,may be integrated within the GPS device of your choice, built-in the dashboard of your car. Imagine the GPS device in your car automatically decides the best routing for you avoiding mass traffic jams. I've seen this feature when i was in Germany, and it's quite awesome to see people turning to nearest autobahn exit at the same time the traffic info being received by their cars, mentioning the traffic ahead is at stand still. I was hoping to see that in KL, and now, or maybe in the near future (realistically), this can now be done right here in our home soil.
However, my only concern is that, in KL, all the roads will be jammed-packed especially during peak hours. So i guess the built in GPS in your future car with live traffic update feature will only display this message before you start your journey home from work - "Stay in the office, all the roads are jammed".