| Ex. AGY-AVIATION-SURFACE-054 | MBTA schedule revisions effective Mar. 17, 2020 (reduced subway, bus, Commuter Rail and ferry service under the COVID-19 emergency)MBTA Announces Schedule Revisions to Take Effect Tuesday, March 17 | Massachusetts Bay Transportation Authority (General Manager Steve Poftak) | Massachusetts Bay Transportation Authority (Massachusetts; division of MassDOT)State | Mar. 16, 2020 | 2020 Q2 | Context (guidance or announcement)Travel and quarantineOther | Confirmed from a secondary source | |
| Ex. MET-BOS-091 | MBTA notice: MBTA discourages all non-essential travelMBTA Discourages All Non-Essential Travel (posted March 23, 2020) | MBTA | Massachusetts Bay Transportation AuthoritySector regulator | Mar. 23, 2020 | 2020 Q2 | Travel and quarantineOther | Confirmed from a secondary source | |
| Ex. ECO-C-012 | COVID-19 Order No. 45Order Requiring Travelers Arriving in Massachusetts to Quarantine or Produce a Negative COVID-19 Test Result | Governor Charles D. Baker | MassachusettsState | July 24, 2020 | 2020 Q32020 Q42021 Q1 | Travel and quarantineQuarantine and isolation | Confirmed from a secondary source | |
| Ex. MET-BOS-093 | MBTA notice: face covering enforcement takes effect November 6, 2020Face Covering Enforcement Takes Effect November 6 (posted November 6, 2020) | MBTA | Massachusetts Bay Transportation AuthoritySector regulator | Nov. 6, 2020 | 2020 Q42021 Q12021 Q22021 Q3 | Face-covering requirementTravel and quarantine | Confirmed from a secondary source | |
| Ex. ECO-C-013 | COVID-19 Order No. 66Order advancing to Phase IV Step 1 and rescinding the travel order (Order No. 45) | Governor Charles D. Baker | MassachusettsState | Mar. 22, 2021 | 2021 Q12021 Q2 | Capacity limitGathering capTravel and quarantine | Confirmed from a secondary source | |