Speeding down that street is pointless, because you are guaranteed to hit a red light if you do.
On the other hand, there was an article here about something Portugal did about speeding. Basically, they would put a useless stoplight in the middle of nowhere. Normally it's green all the time, since it's not actually an intersection. If you approach it while speeding, however, it turns red.
Normally those red lights are placed around schools and such.
If you're a responsible driver, you're already driving at the speed limit at those sites.
Edit: now that i'm thinking about it, a lot of the streets in the TL, fidi, and soma are pretty well timed for bikes, but for a faster pace, like 20 or so, and maybe 25-30 for the big soma streets like folsom, howard, harrison, bryant.
In fact the fastest/cheapest route to prospect heights from lower manhattan is to take the williamsburg bridge to lee ave, to nostrand ave, where you can catch a long stretch of cascading lights.