Hunter-Reay, James Hinchcliffe and Graham Rahal are among the drivers who have spoken against the skids, insisting they made cars difficult to drive in test sessions at Auto Club Speedway and Indianapolis Motor Speedway. The latter session was April 6.

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Downforce is the opposite of lift, and it helps cars go faster in cornering. The best way to create downforce is with the floor of the car, but to accommodate the thicker domed skids the car must be raised, creating a downforce reduction.

To reclaim as much of that lost downforce as possible, teams must raise the wings, which adds drag and creates more disrupted air behind the car. Raising the car also raises the center of gravity, changing the handling characteristics, and inStory highlights Current forecasts show Maria brushing North Carolina's coast Wednesday morning

Maria's winds dropped from 105 mph to 90 mph Sunday but it remained a large, powerful storm

(CNN) The East Coast is bracing for a possible hit from Hurricane Maria, days after the storm caused widespread devastation in the Caribbean.

North Carolina may bear the worst of the storm, as current forecasts show Maria brushing its coast Wednesday morning.

Although it's not currently predicted to make landfall along the coast, Maria is the third hurricane to affect the US in the last month.

"It is likely that some direct impacts will occur along portions of the coast by midweek," the National Hurricane Center said in an advisory Sunday.

Some of the US coast may be under a tropical storm or hurricane watch