Yes, it's still possible to ride the Carqon with one broken steering cable. Although it is highly unlikely to happen, a cable can break if an accident has occurred, when the bicycle is heavily overloaded or if maintenance has never been carried out (Misuse of product). To ensure safety, the Carqon has been equipped with a dual cable steering system. Anyhow, we strongly advise you to have the second cable replaced as soon as possible by a Carqon dealer.