scheduled to end in April 2011. However, service along Line 3 started on 8 February 2011. During construction, for every tree taken down three were planted, for a total of 1,546 trees planted. In addition, it was estimated that Line 3 will carry 100,000 passengers per day. Travel time will be reduced by up to 40%. Line 3 opened on 8 February 2011. Line 4 Line 4 runs from Buenavista railway station in the west of the city eastward towards Mexico City International Airport. In late 2010 the Head of Government of the Federal District Marcelo Ebrard announced a plan to build the new line. Construction on Line 4 started on 4 July 2011, although the start of construction was met with some protest from residents and business owners along the proposed route. Line 4 included a two-step construction process with the first operational segment built between Buenavista and Metro San Lázaro. An extension provides travel between San Lázaro and the airport. Instead of travelling along a single avenue or axis road, Line 4 traffic circulates around the Centro Histórico. To navigate the turns and narrow streets in and near the Centro Histórico, Line 4 uses light buses instead of the articulated buses used on the other lines in the system. The stations for Line 4 look more like conventional bus stops and are built at curbside instead of within a dedicated portion of a central reservation as used on the other lines. Line 4 opened on 1 April 2012. Line 5 On 5 November 2013, Line 5 opened, running along Eje 3 Oriente connecting San Lázaro east of downtown with Río de los Remedios avenue to the northeast. Since 7 September 2020, Line 5 was expanded to southeastern Mexico City, to Las Bombas avenue. Line 6 Line 6 is an east–west line connecting the northwest and northeast of the city, running along Eje 5 Norte from El Rosario to Villa de Aragón Line 6 opened on 21 January 2016. Line 7 Line 7 opened on 28 February 2018, with service along the city's iconic boulevard, Paseo de la Reforma, on part of the line from Monumento Cuitláhuac to La Diana. The complete line will run from Indios Verdes to Campo Marte (one station west of Auditorio), using a fleet of 90 Alexander Dennis Enviro500 double-decker buses with a capacity of 130 passengers each. Hours The MB operates from 04:30