It has become usual recently using road design CAD (Computer Aided Design) on personal computers for efficient road alignment design. There is, however, no function to simulate various road alignments under given constraints by road designers. We developed a program for personal computers that enables us to find the almost optimal vertical alignment by short time simulation. This program makes it possible to design road vertical alignment more efficiently even for persons with a little experience of vertical alignment design or with no technical skill in operation of road design CAD. The optimization method used here will be a basis for the road planning optimization system currently under development.