how frequently does the letter / appear in:
speed bumps are usually installed to slow traffic. and ideally a speed bump would accomplish two things, (1) slow traffic and (2) do that without damaging the vehicles crossing it. but to work as intended, the driver should know in advance that the speed bump is approaching.
here we have a short video compilation of cars hitting a speed bump too fast, and sparks do fly. if the screen clock is accurate these scenes were all captured within a span of about 20 minutes. click the hyperlink to watch the youtube video.
btw, according to bing translator, внезапный лежачий полицейский в о/зуево на ул.северная means sudden speed bumps in the liverpool street/north.

user
In the text, there are two "/"s.
assistant