As others mention will depend on just how dark it is and how many street lights might be around. Wet nights make a difference too, as does the camera's hand-hold ability. I've been surprised how nice many night shots have come out using 400 speed film and shot with my Contax G2 with my 45/2 Planar wide open at 1/15th. Other times, also as mentioned above, Tri-X at 1600 developed in Diafine is really nice, this shot with my Rolleiflex TLR:



To do it best maybe do not mix day and
night shots on the same roll...