When we say something is "not fit for travel", it means that it isn't suitable or safe for long journeys. There are numerous synonyms we can use to express the same sentiment, such as "unsuitable for travel", "unfit for transport", "inappropriate for a journey", "not suitable for a trip", and "not safe for transportation". The use of these synonyms can help to convey the message more effectively, depending on the context and situation at hand. Whether it's a car, plane, or train, it's important to ensure that the mode of transportation is safe and ready before embarking on any journey.