Ellies, especially tuskers, are usually very docile, well, good humoured. Don't get on their bad side though, that is not smart.
When they block a road just look at what they are doing, and what they look like.
If they are in musth give them room, they can be rather capricious. Just back up a ways, out of their comfortzone, and wait. That zone is less than 100 meters, no need to go halfway back the road. You will see when you are far enough easily, when the ellie starts eating it is relaxed. Wait a bit, and it will wander off in search for more food, and you can pass.
If they are young bulls they can be like kittens, wanting to ambush you, or simply stand in the road and not letting a single car go past. Total fun really. Again, just back off a bit, hunger will strike, and you can pass.
Tuskers are often accompanied by guards, called askari's. Those will simply stand in the road and signal you that his highness is about to pass. And will not go out of the way. If you press them you will get trouble, just like with the Secret Service protecting the president of the US.
So in general, just give them space, but don't be scared of them. I have been almost close enough to them to touch (Eh... Do resist that urge! )
but always remember that they do weigh 5~6 tonnes, and easily reach 40 km/h. A feeding ellie is mostly a safe ellie.
: The photos from our trip! Overhere! Feel free to use any of these additional letters to correct the spelling of words found in the above post: a-e-t-n-d-i-o-s-m-l-u-y-h-c