1.
Delhi to Chandigarh is via Narela Route / Safiabad Road via Narela is only route open.
2.
Use EPE / WPE if you are going from other parts of Delhi - NCR.
3.
Go via Signature Bridge, Pushta Road, Khekra (BOrder has bad roads for few km only). Exit at Murthal or Karnal, whichever suites you.