If the car has active traction control (ASR or ASD) there will be a yellow symbol in the center of the speedo that lights up when the system is "keeping you safe". There will also be an idiot light for the system that comes on for the lamp test.

-Jason

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.