As part of our ongoing efforts to highlight the risks that people might face when entering a tunnel, we have introduced a risk ranking for each of those we have personally visited or about which we have detailed information, identifying any general hazards.
The ranking is based on our own observations on the day of our visit, not official inspection reports. The purpose is not to provide a detailed assessment of the risks, but to ensure that those absolutely intent on exploring a tunnel understand that doing so is never risk free. You should make your own assessment before entering and be properly prepared. Conditions change over time and those changes are unlikely to be for the better.
For an overview of the risks encountered in tunnels, visit our page on Safety and the law.