Huai'an is generally considered safe for solo female travelers. The crime rate is quite low and the locals are known to be hospitable and helpful. However, like any other location, it is important to maintain usual travel precautions such as not wandering off to deserted areas alone late at night and being aware of your surroundings. Public transportation is generally safe and reliable. But remember, even in safer places, it's important to stay vigilant at all times.