Reg. the Nagpur-Indore Bypass route, please note following info.: If you are anyway taking Nagpur -Surat highway (Amarawati-Akola-Khamgaon-Malkapur-Jagaon-Dhule), you may take NH3 from Dhule and go towards Indore (slightly North-Eastward), but after Thikri and after crossing Narmada river at Khalghat, take a left and go via Manavar -Kukshi-Alirajpur-Chhota Udaipur-Dabhoi-Vadodara OR Manavar-Kukshi-Alirajpur-Dahod-Godhara-Nadiad. I did take Godhara-Nadiad road recently while going from Indore to Dwarka and Vadodara-Godhara-Dahod-Meghnagar-Thandla-Petlavad-Badnavar-Indore route while returning. Road From Godhara and Nadiad is good and that between Vadodara and just before Dahod is also not bad. About Manavar-Dahod, I understand, it is good, but latest condition is not known to me. For Indore-Vadodara many prefer Manavar -Kukshi-Alirajpur-Chhota Udaipur-Dabhoi-Vadodara route. Vadodara to Ahmedabad is expressway and I used it while returning. Hope this will help. All the best!