The two existing local lines have been electrified and adapted in other ways to Phase 1, but these alterations have not involved any change to their alignment. Furthermore, the heavy rail station at Aarhus, along with existing park and ride facilities near major stops along the route have been refurbished. Various pieces of infrastructure and civil works were performed during the construction phase of the project. During October 2014, work commenced on the boring of a pair of tunnels to carry the tramway between Aarhus University and Aarhus University Hospital in Nørrebrogade. In the following year, both the Randers Way and Nørrebro Street had to be reduced in width in order to allocate space between the lanes for the installation of the new double-track line. In total, eight bridges had to be constructed during Phase 1; of these, the bridge over the Egaa valley, possessing a length of 347 meters, is the largest bridge to be built in the programme. Overall, Phase 1 is to have a total of 110 kilometres long and serve 51 stops once it has been completed. The opening of Phase 1 was originally scheduled to occur on 23 September 2017; however, the event was cancelled only a few hours before the event as a result of missing security clearances from the Danish government authority. Accordingly, the opening date was pushed back to the following month, before being further delayed thereafter. It was said that both the government and the city were inexperienced with tramway operation, since no tramways existed in Denmark 1972–2017, resulting in problems in interpreting the rules. Especially for the old lines, it was unclear whether they could be grandfathered or must obey rules for new lines. On 20 December 2017, it was announced that approval for the new lines had finally been issued, allowing for services on the central tram section to commence during the following day. Traffic on Odderbanen and to Lisbjergskolen was delayed more and started on 25 August 2018. Traffic to Grenaa opened on 30 April 2019. Even prior to work commencing on Phase 1, several expansion plans had already been mooted. During January 2018, it was publicly stated that options for the construction of two new branches, from Lisbjerg to Hinnerup (8 km/5 mi) and from Aarhus to Brabrand (11 km/7 mi), were in the detailed planning phase. From an early stage in the project, it became clear that two different types of rolling stock will be required; to service the city center areas, conventional trams capable of up to 70 km/h were recommended, while hybrid tram-trains capable of a maximum speed of 100 km/h would be necessary to conduct the longer distance routes.