in the beginning of 2020, the Singapore government introduced the circuit breaker measures to curb the spread of the virus. Under these measures, selected public bus services were suspended in two tranches, with adjustments made later. The first tranche of suspended bus services took effect from Wednesday, 8 April 2020, while the second tranche of bus service suspensions started from Wednesday, 15 April 2020. The suspensions lasted till Monday, 1 June 2020; Express and City Direct services all resumed after 1 June 2020, and several recreational and discretionary services were suspended until 30 June 2022, after which all services except 401 were withdrawn. Bus 401 was eventually reinstated on 4 June 2022 while the rest of the suspended bus services were withdrawn from 30 June 2022. Installation of protective screens Since 2016, protective screens were installed to protect bus drivers from potential abuse by passengers. This was expanded during the COVID-19 pandemic to protect from the virus as well. Vehicles Singapore's buses consist of single deck and double deck buses and they are operated by all four operators, SBS Transit, SMRT Buses, Tower Transit Singapore and Go-Ahead Singapore. Articulated buses are operated by SMRT Buses, with several units being transferred to SBS Transit and Tower Transit Singapore as part of the Seletar and Sembawang-Yishun Bus Packages respectively under the Bus Contracting Model (BCM). Routes Singapore has many different bus services plying through the island. These bus routes are categorised accordingly: Trunk: Routes that ply between towns. (e.g. 7, 21, 53M, 133, 162M, 851, 960) Feeder: Services that operate within a neighbourhood. (e.g. 293, 334, 386, 410W, 812, 901M) Short Trip: Routes that operate short haul trips of services which cover high demand sectors of the parent route. (e.g. 3A, 70B, 147A, 222A, 502A, 857A, 965A) Jurong Industrial Service: Routes that service the Jurong and Tuas industrial areas. Operated exclusively by SBS Transit. All Jurong Industrial Services are under Jurong West Bus Package. (e.g. 247, 249, 251, 258) Express: Routes that stop at selected stops and generally run on expressways or long stretches of express sector for faster travel between several towns. (e.g. 43e, 174e, 502, 854e, 951E) City Direct: Service connecting passengers directly to and from the Central Business District during peak hours. Previously operated by private operators. (e.g. 655, 661, 666, 670) Cross Border Services: Services that cross the Causeway or the Second Link into Malaysia. (i.e. 160, 170,