The Highway Traffic Act is amended to impose additional public safety measures related to impaired driving. Zero blood alcohol concentration requirements A driver of a class 1, 2, 3 or 4 vehicle (a semi-truck, bus, larger commercial vehicle or emergency vehicle) is now prohibited from driving with any alcohol in their blood. This prohibition may also be extended, by regulation, to a person supervising someone learning to drive such a vehicle. An alcohol and drug prohibition may be imposed on a driver who holds a class of licence specified in the regulations. A person convicted of an impaired driving offence is prohibited from driving with alcohol in their blood. The prohibition lasts for two years after the convicted person regains their licence. A second conviction within 10 years results in a lifetime prohibition. The same two-year alcohol prohibition applies to a driver who fails or refuses a roadside screening test, but who is not charged criminally. Increased roadside suspension Currently, a driver receives a licence suspension if the driver's blood alcohol concentration is equal to or over 0.05% but under 0.08%; the driver has a positive drug screen; the driver shows poor performance on a physical coordination test; or the driver breaches an applicable alcohol and drug prohibition. The suspension for a first incident is increased from three days to seven days. If a passenger in the vehicle is younger than 16 years of age the length of the suspension is increased by four days; and four days are added to the progressive length of subsequent suspensions of this type. Ignition-interlock program Currently, a driver found to have a blood alcohol concentration of 0.08% or over or who refuses to provide a sample of breath or blood is subject to a three-month licence suspension. A driver who is not charged criminally is required to participate in the ignition-interlock program immediately after their suspension. However, a driver who is charged criminally is not required to participate in the ignition-interlock program unless the driver is ultimately convicted of a criminal offence. The amendments make participation in an ignition-interlock program mandatory immediately following any three-month suspension. Amendments are also made to remove the requirement for a driver convicted of an impaired driving offence to participate in an ignition-interlock program after their post-conviction licence suspension expires. The removal of the requirement is conditional on the Licence Suspension Appeal Board determining that it is not a risk to public safety for the person to drive without ignition-interlock. Drivers' licences A provision of The Highway Traffic Act about licence examinations that is duplicated in The Drivers and Vehicles Act is repealed, with consequential amendments made to The Drivers and Vehicles Act.