bridge's towers. Further emergency repairs were undertaken in mid-1999 after small concrete shards began falling from the bridge into the East River. The concrete deck had been installed during the 1950s renovations and had a lifespan of about 60 years. The Park Row exit from the bridge's westbound lanes was closed as a safety measure after the September 11, 2001, attacks on the nearby World Trade Center. That section of Park Row had been closed off since it ran right underneath 1 Police Plaza, the headquarters of the New York City Police Department (NYPD). In early 2003, to save money on electricity, the NYCDOT turned off the bridge's "necklace lights" at night. They were turned back on later that year after several private entities made donations to fund the lights. 21st century After the 2007 collapse of the I-35W bridge in Minneapolis, public attention focused on the condition of bridges across the U.S. The New York Times reported that the Brooklyn Bridge approach ramps had received a "poor" rating during an inspection in 2007. However, a NYCDOT spokesman said that the poor rating did not indicate a dangerous state but rather implied it required renovation. In 2010, the NYCDOT began renovating the approaches and deck, as well as repainting the suspension span. Work included widening two approach ramps from one to two lanes by re-striping a new prefabricated ramp; raising clearance over the eastbound BQE at York Street; seismic retrofitting; replacement of rusted railings and safety barriers; and road deck resurfacing. The work necessitated detours for four years. At the time, the project was scheduled to be completed in 2014; but completion was later delayed to 2015, then again to 2017. The project's cost also increased from $508 million in 2010 to $811 million in 2016. In August 2016, after the renovation had been completed, the NYCDOT announced that it would conduct a seven-month, $370,000 study to verify if the bridge could support a heavier upper deck that consisted of an expanded bicycle and pedestrian path. , about 10,000 pedestrians and 3,500 cyclists use the pathway on an average weekday. Work on the pedestrian entrance on the Brooklyn side was underway by 2017. The NYCDOT also indicated in 2016 that it planned to reinforce the Brooklyn Bridge's foundations to prevent it from sinking, as well as repair the masonry arches on the approach ramps, which had been damaged by Hurricane