for any passengers wanting to transfer between the SUNIJ and Uithof lines. At this time the Utrechtse sneltram had three lines: Effective 2 March 2020, the frequency of line 22 was increased from 10 to 12 trams per hour per direction. By the beginning of February, the top day for ridership was 18,000. Regiotrams hoped to increase the frequency to 16 trams per hour per direction in December 2020. Effective 20 March 2020, all tram service on line 22 was temporarily replaced by bus line 28 due to the COVID-19 pandemic. With the closure of the University of Utrecht and other institutions in Utrecht Science Park, line 22 ridership had fallen by over 90 percent. Also fewer tram drivers were available because many drivers were calling in sick. Trams on lines 60 and 61 continued to run but less frequently. On 1 April 2020, tram service was reintroduced on line 22 but only during rush hours. Also, double-articulated buses were put into service on bus line 28. These measures were to allow greater physical distancing among passengers which include health workers employed at Utrecht Science Park. On 30 May 2020, the SUNIJ line south of P+R Westhaven was shut down in order to lower and extend station platforms to accommodate coupled pairs of low-floor CAF trams. High-floor trams continued to operate between P+R Westhaven and Jaarbeursplein until 4 July when that portion of the line also shut down. The last day of service for SIG trams was on 3 July, when the high-floor trams had their last runs after 37 years of service. From 4 July, the SUNIJ line was fully shut down for renovation. On 3 January 2021, line 60 from Utrecht Centraal to Nieuwegein Zuid reopened using 7-section CAF trams. (Effective that same date, the tram stop "5 Meiplein" was renamed to "Winkelcentrum Kanaleneiland", with "winkelcentrum" meaning "shopping centre".) On 14 March 2021, line 61 went fully into service between Jaarbeursplein and IJsselstein-Zuid. On 16 March 2021, a coupled pair of trams travelling north towards Stadion Galgenwaard station was struck and derailed by a van at a level crossing along the road Laan van Maarschalkerweerd. No serious injuries were reported, but both the road and tracks required an extended closure, and heavy damage was reported to the overhead wires in addition to damage to the derailed trams, one of which was sprawled across the road. Police allege that