All the states have a good connection of roads in the urban areas with regular long distance buses from many north-eastern states to West Bengal. Self-Driving here is not very advisable due to security reasons. The National Highways 31, 37, 38 and 40 connect Assam to the major cities of India. Since there is not much rail connectivity among the north-eastern states, there are many buses that ply from Siliguri to Sikkim, Assam, and Gangtok. Road trips are however very much attractive to the young group of people due to the sublime landscapes they offer. You can enjoy this pristine region with your vehicle or by hiring a driver, to get a glimpse of some of the most beautiful views.
The roads to north-eastern states are pretty convenient in most of the parts, but if you want to reach an off-beat destination then brace yourselves for all the bumps. Most of the highways in and around Assam as smooth with small puddles here and there. Nevertheless, as you ascend towards uphill, the roads get a little bumpy and will give an adrenaline rush with the steep and narrow slopes. However, within the north-eastern states; Shillong to Cherrapunji, Guwahati to Moreh, Jorhat to Mechuka, Tezpur to Tawang, Gangtok to Tsomgo Lake, and Kalimpong to Zuluk are some of the trips you cannot give a miss!
Duration of Travel: It will take you more than 48 hours to reach by road from Delhi.
Approximate cost per person: The tickets for the bus will cost you INR 2000-3000 depending on the demand.
How to travel by road: Take National Highways 31, 37, 38 or 40, depending on the route you chose to travel. It is easier to reach when you start from Kolkata. However, there would be a lot of landslides and other threats which make it advisable to not travel by road. It is also a bad idea for people who have motion sickness.