SAO PAULO (AP) -- A request for an injunction to stop Twitter users from alerting drivers to police roadblocks, radar traps and drunk-driving checkpoints could make Brazil the first country to take Twitter up on its plan to censor content at governments' requests.

Twitter unveiled plans last month that would allow country-specific censorship of tweets that might break local laws.

"As far as we know this is the first time that a country has attempted to take Twitter up on their country-by-country take down," Eva Galperin of the San Francisco-based Electronic Frontier Foundation said in a telephone interview Thursday.