How to find the final points between two nodes,when using pgr_drivingdistance?
As it is shown in the picture, the pgr_drivingdistance ends at the previous node to the exact driving distance (marked with a red circle).

I mean, I want to know the final point using pgr_drivingdistance from a start point. Normally, this final point is located between two nodes. Is there any way to find those final points?
Thanks in advance.
Would you mind to ask question on the mailing list or GIS Stackexchange? You can find the links on this website: http://pgrouting.org/support.html
The Github issue tracker is used for development and reporting bugs for example. In general not many pgRouting users will read issues.
Regarding your question: pgRouting returns only points, that can be accessed within a certain cost. It does not return the "next" point. The problem is, that the next point could very far away or even could not exist at all. It could be also more than one point. A feature as you request would require a lot more work and therefor would require a contribution or funding.