Ward's Communications today forecast that US light-vehicle sales will remain sluggish in February, continuing the payback for last autumn's incentives binge that pulled car-buying forward from this year. Ward's forecast, updated monthly for subscribers to WardsAuto.com, sees this month's sales of cars and light trucks tracking to a seasonally adjusted annual rate (SAAR) of 15.89 million. Although slightly higher than January's 15.79 million, the SAAR remains below the 16 million level that has become the benchmark of a good month. During fourth-quarter 2001, zero-interest financing swelled sales to an 18.6 million rate.