My solution for "U turn":
http://FantasticContraption.com/?designId=3063153
"Around the bend":
http://FantasticContraption.com/?designId=3063504
"Up the Hump":
http://FantasticContraption.com/?designId=3063642
http://FantasticContraption.com/?designId=3063153
"Around the bend":
http://FantasticContraption.com/?designId=3063504
"Up the Hump":
http://FantasticContraption.com/?designId=3063642