He could have gone over the Rt 110 bridge in Huntington on his way home if he took the Northern State Parkway home. Many people use the NSP as an alternate to the LIE (no truck traffic).
Also, the LIRR does have a station at Rt 110 in Huntington. It's just not on the same line as the Deer Park station, where his car was found. The Deer Park station would be his "home" station. If he were to take the LIRR to work, that would be the station he would use.
It seems kind of odd to me that he would be on the Northern State (or even the LIE) and drive to the Deer Park train station. He would have to drive past his neighborhood to get there. It's probably more likely, IMO, that he took the train that day, for whatever reason.
All we really know is that his phone pinged on Rt 110 in Huntington at 1:45 PM and his car was found the next day at the Deer Park train station. Perhaps he and his phone were not in the same location?
Wife says he is normally home at 3 PM. If he were at Rt 110 at 1:45, that would get him home at about 2 PM, an hour earlier than expected.
I'm more than a little curious about his phone pings for the whole day. He left behind his wallet at home. Perhaps his phone was left on the train?
And was he at work all day?