ERP Effective?

As much as i dun like ERP... it seems rather effective to me.

Traffic on the BKE - PIE towards Changi Airport have been alot more smoother then before... i wonder if it's really the ERP...
Although along that stretch, only 1 extra gantry was put up... the gantry @ rifle range flyover on the BKE... but traffic really have been smooth. Compared to a few months back... every car has to travel below 60km/h becoz of the congested traffic... upon exiting BKE into PIE, its the same.. or worse!
But now... traffic ain't congested no more... car are moving @ 80-90km/h... upon entering PIE... u dun have to squeeze into the lanes... its so much less crowded on the road.

So... is ERP really effective? or are there some other reasons?
Still.. i dun like ERP! *pui*