Sharraxaadda

I would like to report excessive speeding on my street right by Highland Hospital. My street name is Valecito place . MUNI buses and cars speed up to 60 mph down this street it is scary. There is not a speed limit sign at all. Small children live on this street. It is excessive and I don know who to contact or what to do about it. If anyone can tell me please I would appreciate it. How to get a speed sign and slow children sign. This is ridiculous. Blairejahn650@gmail.com
Thank you