Ugh...studies have been done that show that while driving on MDMA, skills remain the same, but reaction time is significantly slowed (compare this to alcohol, where skill level as well as reaction time decrease). So you're totally fine to drive, PROVIDED no person or animal shows up unexpectedly on the road, no car cuts in front of you, and no other driver does something you weren't anticipating. Some people would think those are good odds, but some of the people who think that are the ones who end up dead, or in prison because they hit another vehicle and killed a family of four.
Only assholes who don't take innocent bystanders into consideration drive under the influence, dude. Not to mention that if a cop sees your ridiculous pupils, it doesn't matter if you have any drugs on your person, you can end up in jail, fined, and without a license after they take you in and test your urine.
Get a cab or a sober driver, for the sake of yourself and everyone around you.