Police set up the heavy fortifications after the Ratsadon pro-democracy group called a rally in front of the UN building on Thursday to urge the organisation to back efforts to repeal the draconian lese-majeste law, or Section 112 of the Criminal Code.
On Friday, tourists wishing to visit attractions such as the Grand Palace and Wat Phra Si Rattana Satsadaram (Temple of the Emerald Buddha) were advised to use routes behind the Supreme Court Office and Tai Wang intersection.
Police began dismantling the razor wire barricades on Friday afternoon.