It’s safe to take the legal taxis in these cities, but we do have some illegal taxis ( black car ) which will charge you more money. They won’t charge you in meters and ask high price for certain distance. Sometimes they even change the fake 100 yuan with you under the excuse of that your money is not good. Pls prepare small money for taking a taxi on your own. Pls also ask the receipt from the taxi driver. Most of the illegal taxis always at around the airport or tourist sights area. please be attention about it!