The right-side 9 strokes wrap a
有-shaped middle inside the walking-radical
辶. Historically the simplified
随 collapses
隋 (a phonetic from earlier
隓) with motion
辶 underneath, giving 'going-along-with' as the overall picture. Treat the right side as the motion-with-form unit; same
辶 family in
进 (advance),
退 (retreat),
追 (chase).