Section 38 of the Road Traffic Act, 1994, empowers road authorities, in the interests of the safety and convenience of road users, to provide such traffic calming measures as they consider desirable in respect of public roads in their charge, including the provision of ramps, subject to the consent of the National Roads Authority in the case of national roads. There are no current specifications or guidelines in respect of the size of such ramps. However, the Dublin Transportation Office is at an advanced stage in preparing guidelines in this regard in conjunction with my Department and the Department of the Environment and Local Government.