I see three motorcycles and they are right near the presidential limo. So, yes this would be used as evidence of shots being near the car. The fourth came from the driver and the fifth from the grassy knoll as a distraction for the driver firing the fatal shot.
Royce Skelton's Warren Commission Testimony (back to the list of witnesses)
(Skelton was standing on the triple overpass)
Mr. BALL - Did you see the President's car turn on Elm Street?
Mr. SKELTON - Yes, sir; I saw the car carrying the Presidential flag turn.
Mr. BALL - And did you hear something soon after that?
Mr. SKELTON - Just about the same time the car straightened up - got around the corner - I heard two shots, but I didn't know at the time they were shots.
Mr. BALL - Where did they seem to come from?
Mr. SKELTON - Well, I couldn't tell then, they were still to far from where I was.
Mr. BALL - Did the shots sound like they came from where you were standing?
Mr. SKELTON - No, sir; definitely not. It sounded like they were right there - more or less like motorcycle backfire, but I thought that they were these dumb balls that they throw at the cement because I could see the smoke coming up off the cement.
Mr. BALL - You saw smoke come off the cement?
Mr. SKELTON - Yes.
Mr. BALL - Where did it seem to you that the sound came from, what direction? Mr. SKELTON - Towards the President's car.
Mr. BALL - From the President's car.
Mr. SKELTON - right around the motorcycles and all that - I couldn't distinguish because it was too far away.
Mr. BALL - How long did you stand there?
Mr. SKELTON - I stood there from about 12:15 until the time the President was shot.
Mr. BALL - How many shots did you hear?
Mr. SKELTON - I think I heard four - I mean - I couldn't be sure.
Mr. BALL - You think you heard four?
Mr. SKELTON - Yes.