endplates. the fancy bits on the ends of the front wing that stick up
apparently these gizmos are one of the main reasons it's so tough to drive close to the person in front. they're having a vote tomorrow about whether to change the regulations for 2019. if the motion passes, the result would be simpler endplate designs which would enable closer racing (much needed)
supposedly one or two of the big teams dont want the change to go through because they reckon their endplate gives them an edge