Mettmann is generally considered very safe. As a solo female traveler, you should feel comfortable exploring the area as with any typical urban setting. Standard precautions apply such as being aware of your surroundings and avoiding deserted areas late at night, particularly on foot or using public transportation. The city is socially progressive, known for residents who respect personal space and individual rights, including those of women traveling alone. Local authorities are reliable and emergency services are effective. Scams, pickpocketing, and petty thefts can occur as they would in any city, but are not markedly common. Overall, the risk level for a solo female traveler is relatively low.