From 15 November 2025 at 00:01, until 15 April 2026 at 11.59pm, on the SS637dir Frosinone and Gaeta branch it is mandatory to have chains or snow tires on board. This measure was adopted to ensure road safety during the winter period, when weather conditions can deteriorate rapidly.

The obligation concerns the stretch between the Ceccano Crossroads on the SS637 of Frosinone and Gaeta and the Palombara Crossroads on the SS156 of the Lepini Mountains.

To inform users and ensure safer travel, we recommend:

• Check the weather conditions before travelling
• Make sure you have snow chains on board or fit winter tires
• Drive carefully, maintaining an appropriate safety distance and adapting your speed to road conditions

By following these instructions, it will be possible to tackle the route more safely and reduce the risk of accidents due to adverse road conditions.