City Hall opens a fourth review as westbound closure enters week three.

The westbound span of the Algonquin Bridge will remain closed through at least Thursday morning, city transportation officials said Monday, extending a disruption that has rearranged commutes from Broker to the Exchange and turned the Charge Island approach into a daily exhibition of brake lights.

Mayor Julio Ochoa announced a fourth technical review from the steps of City Hall, describing the inspection as the fastest responsible route to reopening. The mayor declined to give a date, saying the city would not substitute optimism for engineering. Behind him, a temporary sign continued to promise delays through last Friday.

The trouble began with a joint discovered beneath an access plate during overnight maintenance. Two consulting firms disagreed about whether corrosion was active or merely photogenic. A third was hired to reconcile the reports. The fourth review will determine which recommendation should become a repair order.

Bus routes 42, 67 and 108 have added running time, though the Metropolitan Transit Authority has not added buses. Ferries from Hove Beach are carrying nearly twice their ordinary weekday load. Taxi drivers report longer fares and fewer passengers willing to pay for the privilege of watching the meter idle in mid-river traffic.

At a council hearing, transportation commissioner Eleanor Mercer said the structure remained safe under the conditions in which the public is not allowed to use it. Council members accepted the explanation, then spent forty minutes debating which borough had been inconvenienced most convincingly.

The Tree reviewed three versions of the city detour map. One directs commercial traffic through a street closed for resurfacing. Another labels Dukes as Broker. The online edition, updated Monday night, removes the streets and advises motorists to allow additional time.