Purple Map Items (Table Top Racing: World Tour)

What to do or how to activate purple items on the map during races with weapons? Already fired missiles and crashed. How to activate and what do they do? Thank you in advance!
UPD: I found a solution myself) When it is possible to combine the selected weapon, you need to collect a double (triple) rocket and shoot. Opens either a cut off the track or the ability to prevent the enemy or the passage to the coins.