It can be inferred from the passage that
Passage –III
With a phalanx of Dallas police motorcycle officers clearing the way ahead, the big limousine carrying the Kennedy family made a 90-degree turn from Main onto Houston in front of the Dallas County Sheriff's Office. Almost two dozen deputies and other lawmen stood on the sidewalk watching.
Atop the building was a large Hertz Rent-A-Car sign that had a digital time and temperature display. In front of the Depository, the limousine slowed to a crawl to make a 120-degree turn onto Elm Street, although turns of more than 90-degrees were prohibited by the Secret Service. The turn was so tight that Greer almost ran the limousine up onto the north curb near the Depository's front door, according to Depository Superintendent Roy Truly.
The car continued a slow glide down the incline of Elm into Dealey Plaza, maintaining its position in the center lane of the three-lane street. The crowds thinned out as the Triple Underpass approached and security men began to relax. About three car lengths ahead of the presidential limousine in the lead car, Agent Lawson, a former Army counterintelligence man now with the Secret Service White House detail was sitting in the right front seat. He looked at his watch. It was 12:30 p.m. Picking up the car's microphone; he radioed the Trade Mart saying: 'We'll be there in about five minutes.’
In the presidential limousine, Kennedy was waving to his right hand at a group of people standing near a sign reading STEMMONS FREEWAY. His right arm and hand was slightly over the side of the car. Mrs. Kennedy had been waving to her left, but her thoughts were on the Texas heat. Mrs. Kennedy later told the Warren Commission: 'And in the motorcade, I waved to the left side and Mr. Kennedy was waving mostly to the right and that explains why we were not looking at each other very often. The climate also was very inhospitable; it was extremely hot and the heat was blinding us.’ Sensing her discomfort, Mrs. Connally, an old acquaintance of Mrs. Kennedy’s, turned and said: 'We'll soon be there.'
Mrs. Kennedy recalled seeing the Triple Underpass ahead: We saw that we were approaching an underpass, which I thought at the time was a blessing for us as it would offer respite from the heat.’ Mrs. Connally had wanted to mention the warm and enthusiastic welcome for some time, but she had held back. Now she could contain herself no longer. Turning to Kennedy, she said: 'Mr. President, you can't say that Dallas doesn’t love you.' According to Mrs. Kennedy, the President smiled and replied: 'No, you certainly can’t.’
Soon after this remark Mrs. Connally heard a frightening noise off to her right. She looked in that direction and caught a peripheral glimpse of Kennedy raising both hands to his neck. She heard no sound from the President, but noticed a blank, ‘nothing' expression on his face. Kellerman, sitting directly in front of Connally and Kennedy, noticed they had just passed a highway sign when he heard a 'pop' to his right and immediately looked in that direction, surveying the easternmost slope of the Grassy Knoll. Kellerman told the Warren Commission: turning to the right to view whatever it was ...I heard someone saying that he had been hit and I was pretty sure that it was the president. Also I remember him putting his hands up here like this [indicating both hands up near the head] . . . [It] was enough for me to verify that the man was hit.
Immediately after this I grabbed the speaker and said to the driver, “Let’s get out of here we’re hit,” and agin I spoke into the microphone, ’Lawson, this is Kellerman………we are hit and need to go to the hospital immediately.’ And just as I talking , I heard a flurry of shells come into the car.
Mrs. Connally testified she heard Kellerman say: 'Pull out of the motorcade. Take us to the nearest hospital.' The limousine indeed pulled out of the motorcade and raced to Parkland Hospital.
Driver Greer said he was busy looking ahead to the railroad overpass when he heard a noise he thought was a motorcade backfire. Then he heard the noise again and caught a glimpse of Connally starting to slump over. He then heard two more noises that seemed to come one on top of the other. Greer said after the second noise and a glance over his right shoulder at Connally, he stepped on the accelerator. However, a film taken that day shows the limousine brake lights remained on until after the fatal shot to Kennedy.