Motorists may not see you when you try to move back into traffic. Walk your bike across. Learn to scan the road behind you while riding. Look back over your shoulder without swerving, or use a rear-view mirror. Eye contact is important with any driver which might pose a threat to your safety.
Some riders use rear-view mirrors.
Cross railroad tracks at right angles. Allow extra distance for stopping in the rain, since breaks are less efficient when wet. In rain wear a pancho or waterproof suit. Wear a sturdy helmet to protect your head. Wear bright colored clothing.