Contact your local town, and ask them if it is acceptable for you to add some asphalt mix to make a small ramp there, adequate for a wheelchair to roll up. Make sure they understand why you want to do so, that it is necessary for wheelchair accessibility for your father in-law. Then follow their directions. You might even be surprised and find they do it for you if you asked nicely.
Edit: Another possibility - find a contractor who can grind down the curb in one part of the driveway. While this too may require permission, it may be easier to obtain, since no mods would be done to the road surface itself. If you are handy, you could probably do the work yourself, with a small (rental) electric jackhammer.
My approach would be cheaper yet. Cut many parallel kerfs in the curb with a diamond blade in a Skilsaw or an angle grinder. You can buy such a blade for only a few dollars at your local home center. Make these kerfs no more than about 1/2 inch apart, and slope the depth of the kerf so that the cuts are deepest at the street. Now, take a hammer and cold chisel, or an air powered chisel, and break out the material between the kerfs. Done carefully, this will leave you with a nicely sloped curb that a wheelchair can ride up over, and nothing on the road itself to upset the town. You can surely do this in a way that looks as if it were professionally done if you take your time.
Of course, if you do this work yourself, use ear protection for the noise and definitely wear a respirator. That dust is terribly bad for your lungs.
Go back in time and wait 24 hours before using the hose. Then use it a couple of times a day for a month.
Other than that, or replacing the whole driveway, probably not. You could do various things to the surface spots, but they are exceedingly unlikely to match the rest of the surface.
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If this was done by a licensed contractor it should be all one color.call and ask if they know why and if they will fix it. the next step would be to call the state contractor's board. no matter what color of stain you use it will have dark areas.depending on the variegations between light and dark it could look very good if the right color is used. an epoxy paint might cover it if heavy enough.the main issue is if the concrete was mixed properly.If it was not it could deteriorate far before its life expectancy is reached.