8. The vacuums do not need to be turned on during the opening procedure until the first car comes out of the tunnel. a. True b. False

## Step 1<br />The problem presents a statement about the operation of vacuums during the opening procedure of a tunnel. The statement is: "The vacuums do not need to be turned on during the opening procedure until the first car comes out of the tunnel."<br /><br />## Step 2<br />The task is to determine whether this statement is true or false. The statement implies that the vacuums are not needed until the first car comes out of the tunnel.<br /><br />## Step 3<br />However, in the context of tunnel operations, vacuums are typically used to ensure safety and smooth operation. They are used to remove any debris or obstacles that may pose a risk to the cars passing through the tunnel.<br /><br />## Step 4<br />Therefore, the statement is false because vacuums are indeed needed during the opening procedure, not just when the first car comes out of the tunnel.