Perhaps the first autumn leaves are starting to fall on your lot. And according to Black Book, so are car prices.

The latest Black Book Market Insights Report highlighted that car segment depreciation has accelerated during the past two weeks, with sporty cars, midsize cars and full-size cars seeing some of the largest weekly depreciation since the start of the year.

Based on volume-weighted information, editors determined overall car segment values decreased by 0.25 percent last week. In comparison, the market values had decreased by only 0.02 percent on average during the prior four-week period.

With summertime officially in the rear-view mirror, Black Book noticed that the sporty car segment experienced the biggest drop, sliding by 0.36 percent or $56.

Values for midsize cars dipped by 0.33 percent or $29, and values for full-size cars ticked 0.32 percent or $37 lower.

Looking at volume-weighted data from the truck side, editors indicated overall truck segment values — including pickups, SUVs and vans — decreased by 0.13 percent last week. In comparison, the market values had declined by only 0.06 percent on average during the prior four-week period.

Within trucks, Black Book noticed the full-size luxury crossover/SUV segment performed the worst, deteriorating by 0.33 percent or $104.

Turning next to observations from Black Book’s personnel stationed at nearly 60 weekly sales nationwide, activity in the lanes picked up depending on what kind of vehicle crossed the block. Here is the rundown:

— From Michigan: “Cars with above-average mileage are softening somewhat. Truck prices are still really strong, but many believe that they have reached the top of the market.”

— From Indiana: “Retail is still good, which is dictating the wholesale market as is the continued low supply at auction.”

— From Florida: “The finance companies are able to sell their late model vehicles for good money. The older cars are struggling, even those in average condition.”

— From South Carolina: “Sellers are holding their floors, which resulted in more no-sales today. There also didn’t seem to be as much urgency to buy.”

— From Texas” “Overall a really good day with brisk bidding, which resulted in a good sales percentage and strong prices.”