Juneau is the only US state capital with no road access. It can only be reached by air or sea.
Juneau, Alaska is the only US state capital that cannot be reached by road from any other city. No roads go to it. See for yourself in the link below. Honolulu, Hawaii is also the other capital that can only be reached by water and air methods. Therefore, there are two capitals that can only be reached by means of air/water transportation so this question isn't fully relevant.
Alaska
The highest road in the U.S. is Colorado state.
Juneau, Alaska.
California
Ohio
Yes.
The National road was important because it was the first highway to be built by the government. The road's construction began in 1811 and reached West Virginia in 1818. The road follows much of what is now US-40.
he reached India by road
Alaska
Juneau, Alaska And you can reach it by Air as well.