Shutter Speed Effect?

I have some night city footage that i would like to make more interesting. Specifically, some traffic timelapses, crowded people shots, spins, etc and I want to make it delayed and blurred out, i.e. like a slow shutter speed. Is there something in final cut that will let me do that?

I've tried adjusting clip speeds and motion blue, delayed clip on top w/ diff composite modes, etc. Nothing really gets the look i want, I know Motion has some time delay type filters, should i go there?

thanks...

eureka4.0 has a really cool filter called Strobe Dissolve. If i am not mistaken you can buy it in the LAFCP store
it does exacly what you are looking for

Arod -