All five eyewitnesses interviewed by police said the woman had a green light and that the boy sped into the street. Three of the witnesses told police they doubted the woman could have taken any action to avoid hitting the boy.

There is no indication in the police documents that the marijuana played a role in the crash. Capt. Richard Bach, who oversees the MPD’s traffic division, declined to comment, and the district attorney’s office did not return a call.

The crash happened just after 9 a.m. The woman, who works at UW-Madison, had just dropped her son off at a child care center and was driving east in the center lane of University Avenue. The driver of a minivan in the lane immediately to her right told police the boy was pedaling north on Ridge Street and entered the intersection without appearing to have stopped.

The minivan driver braked hard and swerved, barely missing him. The boy kept pedaling into the path of the woman in the center lane, who told police she saw him only at impact.

The minivan driver and other witnesses said the woman appeared to be traveling below the posted 35 mph speed limit, in part because traffic had been stopped at an earlier stoplight and had not returned to full speed.