I don't know what the Sven Lakes approach road is, but we started descending the wrong road for a short bit (I think the one that goes into Jersey rather than back to 9W?) and it sucked really bad - super rough and very unpleasant. we whipped down for about 2 minutes, realized it was the wrong road due to its rough suckiness, then climbed back to the top to get back on the right track. smoothness in 1) above only applies to the way I went. good luck.