SPEED cards need to be played immediately. They cannot be held in the player’s hand. If a racer lands on a ‘Take a SPEED card’ space, they will take the top card from the SPEED card deck, turn it over and move according to the card’s instruction. The card is then placed face-up in the adjacent discard pile. (Should you play long enough to run out of face-down SPEED cards, take the discarded deck, shuffle and place all face-down again.)
If a racer picks up a SPEED card with an action they are unable to complete, such as ‘Slipstream past a racer!’ when they are in the lead, they do not move but just discard the card.