There are several conflicting 2nd and 3rd hand "witness accounts" floating about, but this one is demonstrably false.
The shooting took place at approximately 09:15:00. The 911 call was received at 09:19:00. Four police cars were on the scene by 09:21:52 (the first at 09:20:44). The roadblocks did not go up until approximately 09:30:00. At the time immediately after the shooting, and for at least 15 minutes thereafter, there were no roadblocks on Rt. 50.
We can say with some certainty that they didn't just sit there for 15 minutes, with a parking lot full of police only yards away.
Second, if he was in the access road (not detailed in any witness account, but in my view likely), there is a 15-foot grass median between that and Rt. 50. Then, there is a second median between the east and west sides of Rt. 50. Which median was he seen crossing? One? Both?
Crossing one would send them eastbound on Rt. 50. Crossing both would send them westbound. There are other "witness" accounts saying they went east, or that they went west. Which of these is true or accurate?
Until the police release an account of actual eyewitness reports, nothing should be taken as gospel. The newsies are propagating dribs and drabs of "witness reports" which are either in direct conflict or which make no logical sense, as above.
Re: crossing the median. I doubt if the report is false. It might be irrelevant to the shooting.