Most acute intersection?

[hbelkins]

Can't see it well from the overhead view on Google Maps because of trees, and the map itself misrepresents the intersection, but TN 148 and the US route foursome where you turn up to Lookout Mountain should almost certainly qualify.

[hotdogPi]

US 4 at the left fork, US 3 at the right fork.

[agentsteel53]

US 4 at the left fork, US 3 at the right fork.

nah - you can see the implied turnaround at top left of photo.  no one is expected to make the super-acute angle.

[1995hoo]

I had forgotten about this one west of Hershey, PA, until I drove through there last weekend on the way to a hockey game. Rather acute on both sides. The guy in the pickup who's facing the camera waiting to turn left would basically have to make a U-turn if he wanted to head down that street on the right. (If you pan the camera around to look behind the Street View car, you'll see that street briefly runs directly alongside US-322 in an arrangement similar to, but not the same as, a frontage road.)

http://goo.gl/maps/q9R3l