The hackers blocked the site and posted some malicious and anti-national content under the web name 'team Pakistan cyber attackers' alleging atrocities against Muslims in Kashmir.
The website www.vizagtrafficpolice was hacked around 2 PM in Sunday and subsequently restored on the same day.
Police said the IP address of hackers has been traced to Istanbul and they were probably radical Islamic organisations who have been targeting the websites of Indian government at random.
When contacted, ADCP (Traffic) K Mahendra Patrudu confirmed the incident.
"I don't know why the website of traffic police was hacked as it does not provide any key information. However, we are not taking the issue lightly as the hacker(s) pasted some malicious content," the officer said.
Meanwhile, sleuths of the Cyber Crime Investigation Cell has begun investigating the matter, he added.