Johor Bahru is generally safe for solo female travelers during the day, but you are advised to avoid walking unaccompanied late at night, stick to busy and touristy areas, be cautious while using public transport, and always keep an eye on your belongings. When traveling to less populated areas, it's recommended to go in groups. Locals are friendly and can be quite helpful. However, petty crimes such as theft and pickpocketing are common, particularly around crowded places like public transportation hubs.