By Rachel Rock
BU News Service
Nighttime workers from Highway Safety Systems, Inc., paint the crosswalks at the intersection of Commonwealth Ave. and Center St. in Newton, Massachusetts, on Saturday, April 13, 2019. The upgrades come a few days in advance of the 2019 Boston Marathon. (Photo by Rachel Rock/BU News Service) 
Nighttime workers from Highway Safety Systems, Inc., paint the crosswalks at the intersection of Commonwealth Ave. and Center St. in Newton, Massachusetts, on Saturday, April 13, 2019. The upgrades come a few days in advance of the 2019 Boston Marathon. (Photo by Rachel Rock/BU News Service) 
Nighttime workers from Highway Safety Systems, Inc., paint the crosswalks at the intersection of Commonwealth Ave. and Center St. in Newton, Massachusetts, on Saturday, April 13, 2019. The upgrades come a few days in advance of the 2019 Boston Marathon. (Photo by Rachel Rock/BU News Service) 
Nighttime workers from Highway Safety Systems, Inc., paint the crosswalks at the intersection of Commonwealth Ave. and Center St. in Newton, Massachusetts, on Saturday, April 13, 2019. The upgrades come a few days in advance of the 2019 Boston Marathon. (Photo by Rachel Rock/BU News Service) 
Nighttime workers from Highway Safety Systems, Inc., paint the crosswalks at the intersection of Commonwea lth Ave. and Center St. in Newton, Massachusetts, on Saturday, April 13, 2019. The upgrades come a few days in advance of the 2019 Boston Marathon. (Photo by Rachel Rock/BU News Service)
Runners on the carriage road along Commonwealth Ave in Newton, Massachusetts, on Saturday, April 13, 2019. They are one of many groups keeping loose in advance of the 2019 Boston Marathon. (Photo by Rachel Rock/BU News Service) 
One of the many “See something, Say something” signs along Heartbreak Hill in Newton, Massachusetts, on Saturday, April 13, 2019. In the aftermath of the 2013 Boston Marathon bombings, the signs became a fixture along the route. (Photo by Rachel Rock/BU News Service) 
Trash collection bags await pickup on Commonwealth Ave in Newton, Massachusetts, on Saturday, April 13, 2019. In advance of the Boston Marathon, MA Trial Court Community Service participants walked the route picking up trash. (Photo by Rachel Rock/BU News Service)
