I played pc version today. To change radio station on pc you need press f1 (i remember on ps1 it's can too). Radio station on PC continie playing then you enter in car (on dreamcast doesn't! It's start playing again).
PC and PS1 has car damage, Dreamcast port not. I played all 3 version (PC, DC, PS1).
Photo PC version with car damage https://yadi.sk/i/l93Yezg_3QLxbm