Widening my driveway

I removed some trees and now widening my driveway as illustrated in the image below. Not sure how to proceed because I’m stuck on the following questions:

1. What type of driveway is it? Dirt? Crushed blacktop? One thing I’m pretty sure of is that there must be a layer of crushed stone or gravel underneath because my driveway has been quite stable.
2. If I widen the driveway, do I have to change the crowning from the solid blue line to the dashed blue line or can the high point remain where it is?
3. Can what I’m trying to do be accomplished by adding material (i.e. 3/4" crushed stone + something finer – if so, what?) on the right. What I’m trying to avoid is a major digging project which achieving a consistent look across the width of the driveway.