Locking all doors and keeping windows closed while in your car. Undertake some self-defense training. Take different forms of transportation until any threat disappears. Flee to the nearest safe place - a restaurant, hotel or store. Hail and jump into a taxi and head for a safe haven.
Sexual assault is always a risk.
Properly protect your home - install extra bolts, locks and alarms. Use only first initials in directories, apartment listings and mailboxes. Tell strangers you live with a friend. Scream, or blow a whistle - this scares off some aggressors. Practise these safeguards until they become second nature - but may you never have to use them.