Hi, I'm a 25yo on my first roadtrip after law school and am driving my car back to LA. My two younger siblings are flying out to drive with me, and I want to show them the Badlands, Mt. Rushmore, and go through Custer Park
I've heard the fastest way is to go from I80 to I15, but the Badlands are on I90.
(1) Therefore, from Chicago should I just travel on I-94 to I-90 until I hit the Badlands and then go south on I-25 to get on I-80?
Should I start on I-88, then go to I-80, north on I-29 to hit I-90 in Sioux Falls, SD just before the badlands?
Also, speed is a bit of a factor because we don't want to drive more than 500 miles a day and want to spend 1 day in Vegas and 1 day in the Badlands and make it to LA in 6 days.
(2) After SD, what is the fastest way to get back on I-80 from the tiny highway 16A that goes through Custer Park?
Should I take 16A up to I-90 and then I-25 south?
Should I stick to the smaller highways and take 16A to 85 and then meet up with I-25 south to get back on I-80?
Hopefully someone can shed some light on this. Thanks so much!!