London is generally a safe and friendly place, but like any large city it's wise to take a few precautions. Make sure your possessions are properly insured before you travel, and don't carry all your valuables around with you. Carry as much cash as you'll need that day, and leave the rest in your hotel safe. Don't use ATM machines after dark, avoid isolated or poorly lighted spots, and try not to travel around on your own late at night. Keep bags zipped up and close to you in the Tube, on buses, and at pubs and other crowded places. Never leave bags unattended in any public place—it may be stolen or seen as a security threat. Finally, use black cabs and don't get into a minicab on your own.