According to Toshshahartransxismat, this applies to routes passing through the places where testing takes place.

So, buses 19, 50, 63, 115, 85, 88, 152, 24, 51, 67, 91, 93, 95, 140, 2, 38, 89, 136, 44, 68, 155, 17, 58, 60, 76, 53, 64, 65, 141, 196, 133M and 28M will walk along the route from five in the morning. They will pass through the test locations of the city.