The FIA has issued a technical directive clamping down on a suspension trick employed by multiple teams during the 2017 season.
Suspension is a key area of development due to the performance gains it can deliver, but adjustable ride height systems are often banned as soon as they're discovered and that's the case once again with this latest development.
The FIA's Charlie Whiting has written to all the teams informing them that a new system, whereby steering angle determines ride height, therefore lowering the car in a corner, will be outlawed.
"It became clear during the season that some teams were designing the suspension and steering systems in an attempt to change the front ride height of the car," wrote Whiting.
"Whilst some change is inevitable when the steering wheel is moved from lock-to-lock, we suspect that the effect of some systems was a far from incidental change of ride height.
"We also believe that any non-incidental change of ride height is very likely to affect the aerodynamic performance of the car."
Whiting explained that such a system was effectively a moveable aerodynamic device, which is banned under the rules with one exception, the drag-reduction system (DRS).
"Any car system, device or procedure which uses driver movement as a means of altering the aerodynamic characteristics of the car is prohibited," the directive added.
"It is our view that such steering systems should be treated in the same way as suspension systems, i.e. that the 1993 ICA ruling should apply when assessing compliance with Article 3.8 of the Technical Regulations.
"Hence, any change of front ride height when the steering wheel is moved from lock-to-lock should be wholly incidental."
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