Haldia can be moderately safe for solo female travelers. As with any destination, it's important to take standard precautions. Occasional instances of petty crime can occur, and it's recommended to avoid isolated areas, especially at night. The locals are generally friendly and willing to help, but understanding the local culture and being respectful is key. The police presence is sufficient and public transportation, though crowded at times, is reasonably safe. Make sure to keep in touch with friends or family so someone knows where you are at all times.