The call came in just after 1 a.m. “Hey, I got a question for you,” the male voice said. “Am I right that it’s not OK to walk to Rhode Island on Route 1?” O’Connell on dispatch managed to get out “What?” before the guy continued. “Walking on Route 1 .. I didn’t think it was allowed and just wanted to check.” The voice sounded semi-sober; O’Connell had heard plenty worse. But sober or not, who would think of walking to Rhode Island on Route 1, aka Boston-Providence Highway? A four-lane divided highway lined with shopping malls, office buildings and car dealers. It had to be at least 30 miles to the Rhode Island line. Sure, there were stretches in Grenville with sidewalks; but had he ever seen anyone on them? And going south through Norwood, Walpole . . . Sidewalks? He had no idea. Still, the guy had asked. “Well, I don’t know there’s any law against it,” answered O’Connell. “Why are you headed to Rhode Island? Kind…