The essential elements of contravening section 55(2) of the Road Traffic Act are: (a) one drove/attempted to drive a motor vehicle; (b) while under the influence of alcohol or drug or both; (c) to such an extent as to be incapable of having proper control of the vehicle. All these elements must be incorporated in the charge and canvassed with the accused. However, where an accused admits the conduct and the facts clearly demonstrate incapacity to control the vehicle, the conviction will stand despite deficiencies in framing the charge. Section 55(5)(a)(i) of the Road Traffic Act makes prohibition from driving (for not less than 6 months for first offenders) and cancellation of licence mandatory upon conviction under section 55(2), unless special circumstances exist. Trial magistrates must enquire into special circumstances before imposing sentence and must thoroughly acquaint themselves with relevant statutory provisions before sentencing.