The cap is 35 mph according to the link here: <a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10558220" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10558220</a><p>It looks like Google limited it to 25 mph on their own accord.