Seasonal price declines in the lanes are expected to grow a bit steeper this week, with all segments projected to decline slightly.

According to NADA Used Car Guide, wholesale prices, on average, are expected to fall by by 0.9 percent, or $125.

“In general, overall declines across all segments are expected to accelerate this week; this is a normal occurrence as we have now entered the fall selling season,” said David Paris, NADA UCG automotive analyst.

The biggest declines are forecasted in the midsize van segment. This segment is expected to see prices fall by 1.5 percent, or $200.

This may not be surprising, since in September, all brands in the minivan segment saw large price declines, according to the latest Kelley Blue Book’s latest Blue Book Market Report

Specifically, the Dodge Caravan saw  biggest percentage decline. Prices for this model fell by 2.8 percent in September, KBB said. The Chrysler Town & Country followed closely behind, with prices falling by 2.7 percent, according to the report.

“In the upcoming months, we are expecting to see values continue to decrease as they have in previous months,” the KBB analysis indicated.

And this week, coming in behind the midsize van segment for price declines will be luxury cars, midsize cars, and compact cars, with declines ranging from 1 percent to 1.3 percent, NADA UCG reported.

For the bigger segments, large SUVs and large pickups are both expected to slip by about 0.5 percent, or $100, each, followed by compact utilities with a  0.7-percent ($100) decline, according to NADA UCG.

Again, the fact that the pickup segments are seeing slightly lower price declines than some of their smaller counterparts may not come as too much of a surprise.

KBB’s Blue Book Market Report shows that while values for used midsize pickup trucks, in particular, were mostly flat in September, the numbers show big jumps from previous years.

In fact, prices for this segment are up 1.5 percent year-over-year and 9.7 percent higher than September 2011, according to the report.

And as many segments are experiencing seasonal declines as fall gets underway, what is pushing price strength for the midsize truck segment? According to the KBB report, lack of supply, a situation dealers have become quite used to in recent years, is pushing values up.

Four- and two-week AuctionNet wholesale average prices are created by collecting all AuctionNet records for vehicles  up to five years of age for a specified period of time.  Prices are then adjusted for changes in mileage and mix.

Current week prices are based on NADA's proprietary used-vehicle value model which includes assumptions for new-vehicle prices, used-vehicle supply, gasoline prices, and other economic factors.

Sarah Rubenoff can be reached at srubenoff@autoremarketing.com. Continue the conversation with Auto Remarketing on both LinkedIn and Twitter.