I'd take it to a local vet, the kitten could be chipped or being looked for.
How small a kitten was it? Old enough to be out on it's own and did it have a collar on and look like it was a family pet, rather than a stray?
I was hugely grateful in the past on two occasions when my cats got knocked down, one lady came looking for the owner, found me and brought her back to me, the other was taken to a vet, who phoned me after scanning for the microchip. Incredibly sad both times but I was so grateful to know and make arrangements myself. I'd have been frantic not knowing.