Stay aware of your surroundings. Avoid "zoning out" while travelling on public transportation. Watch for anything or anyone unusual. Pay special attention to anyone who looks especially nervous or is wearing unusually bulky clothing, as it may contain a bomb.
Refuse to accept packages from strangers. If someone asks you to carry a suspicious package, you should report it to authorities immediately.
Stay with your luggage and report any unattended bags in the station or on the vehicle to the driver or to the police.
Note the location of all the emergency exits on any bus, plane or train you are travelling in. Plan on how you would escape in the event of an incident.
Carry your medical information with you in case of injury. This will help emergency responders treat you effectively in the event of a terrorist attack.
Carry a dust mask with you. This will help in the event of an explosion, which can result in dangerous dust levels. You may wish to carry a gas mask if you have reason to believe that a chemical attack may happen.
Arrive early for journeys on public transportation. This gives time for proper security procedures to be observed without disrupting your schedule.
Carry a cellular phone. You can use it to call emergency numbers in the event of an attack.
Listen to government warnings and threat assessments. There may be certain times when the risk of attack is identifiably high and avoiding public transportation advisable.
Avoid rush hour travel if possible. Terrorists tend to target crowded vehicles, which means busy hours of the day.