Quality Department specialist search Goolge John Mueller told that Google does not limit the traffic to the sites and does not establish quotas for the visit. This became known during the regular hangout for webmasters.
A few years ago among foreign webmasters discussed the possibility that Google controls the traffic to the sites. Proponents of this theory believe that Google allocates to each share a certain number of visits per day, and after the exhaustion limit site redirects traffic to another site that he also had a visit. Some SEO-experts believe this theory absurd, and some - quite reasonable.
Listen to the answer Mueller can, starting with 33:48 mark of the video:
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