This model is in N-Scale. I have cut out and glued in place a Wall (rear), sidewalks and the subject of this section - the curbs at the driveway entrance.

I used a paper cutter to cut the curbs from some Concrete scrap.  Using the paper cutter guaranteed that the curbs were straight and even.  Scissors work good too. I ran a bead of testors model cement on the bottom of the curbs and then wiped it off so it wouldn't bleed.  Realroad is flexible so I cut the curbs straight and then bent them to fit.  I used a ruler to make sure they were straight as I glued them in place.

Remember that this model is in N-Scale. Have you ever seen curbs like these before? Me neither.