Mr. Salley said the drop in traffic began in 2000.
(It also remains open despite a steep drop in traffic).
Like the BBC, newspaper websites experienced a slight drop in traffic on Tuesday.
Google confirmed "a sharp drop in traffic" that could not be attributed to equipment failure on its end.
Those are darker than previous estimates, of a 9.9percentt drop in traffic and a 0.1percentt increase in sales.
The introduction of paywalls for Times and Sunday Times content in 2010 led to a 90% drop in traffic.
"Last year's drop in traffic fatalities is welcome news, and it proves that we can make a difference," the transportation secretary, Ray LaHood, said in a statement.
The authority also claimed nearly $9 million in losses from its bridges-and-tunnels division, citing a steep drop in traffic across all services, among other factors.
A Facebook spokesman, Andrew Noyes, said the company had seen a drop in traffic from Egypt on Thursday and only minimal traffic on Friday.
The drop in traffic in Cincinnati, for instance, came as Delta decided to focus on Detroit after its merger with Northwest Airlines.
