You can claim easmentary right of necessity as there is no other access to your land 

2)

Section 13 of the Indian Easements Act deals with easement of necessity An easement of necessity means an easement without which the property cannot be used at all. Mere convenience is not the test of an easement of necessity. It can be claimed only when there is absolute necessity for it, i.e. when the property cannot be used at all without the easement and not merely where it is necessary for its reasonable, or more convenient enjoyment. A man cannot acquire a right of way as an easement of necessity, if he has any other means of access to his land however more inconvenient it may be than be passing over his neighbours.

3) under section 35 of easement act you can obtain permanent injunction restraining your neighbour from obstructing your right of passage . pending hearing and final disposal of suit you can claim interim reliefs .

Dear client, 

yes, you will have to buy the land. It is very unlikely for the easement act to help you out in this case. 

Thank you

You have two options:

1.to purchase the adjacent land from yor neighbor after which you can utilise it exclusively for your own purpose alone, i.e., whether you lay a rod or construct a building in it.

By this process you may avoid unnecessary litigation and its repercussions, i.e., litigation expense, lawyer's fee, your valuable time and energy.

This option may provide you a easy and permanent solution to your problem;

2. By this option, you may have to file a suit for easement rights for road access from your property to road, i.e., ingress and egress purpose.

You may file  suit for easement by necessity on the basis of  your documents and by operating law of adverse possession as well as by predecessor's rights.

The suit may run for years by which you will have to meet the litigation expenses besides lawyer's fee and also have to run between court and home frequently for the purpose of this case.   

You can seek easement rights through court

It should be sufficient for car to pass 

2) mere walk through is not sufficient 

3) rely upon affidavit of witnesses that earlier road width was sufficient for cars to pass through 

The purpose is easement by necessity for ingress and egress purpose.

You had been using the pathway all these years in the land belonging to other person (neighbor), since you have a mention about the permission to use the land for your easement purpose, you can claim mentioning the extent, let the court decide about the extent that can be allowed in the given circumstance. 

If it was an agricultural land, then you can very well claim passage for bullock cart passage. 

you may not be able to claim easement rights to the extent of passage of four wheeler through that passage even though you had been using it so long, or you can offer to buy that extent of land for your exclusive usage in your suit for easement rights.

1. There is no such straight jacket formula

2. Yes if they allow no right

3. Yes you can claim the same from court