Assurance has been given by both operators and authorities, that many actions have been taken in an effort to ensure the safety of passengers, with SBS Transit having to make greater efforts in actively publicising its safety considerations on the driverless North East Line before and after its opening. Safety campaign posters are highly visible in trains and stations, and the operators frequently play safety announcements to passengers and to commuters waiting for trains. Fire safety standards are about the same as the strict guidelines of the US National Fire Protection Association. Platform screen doors are installed at all underground stations, with half-height platform screen doors installed at all above-ground stations. These doors prevent suicides and disallowed access to restricted areas, as well as keeping normal temperatures in stations. Bylaws reduce uncivil, disruptive and dangerous acts, such as smoking, the consumption of food and drink, using safety features in an evil way, and unlawfully going onto the railway tracks. Penalties ranging from fines to jail are given for these offences.