'impetus toward' is correct and can be used in written English.
You could use it to describe a motivation to initiate a course of action. For example, "The inspirational speech provided an impetus toward his decision to quit his job and start his own business."
Without public support the impetus toward privatisation may soon falter.
The strategy will provide some impetus toward achieving this.
Eloquent rules are noisily broken, in a milieu infused with an impetus toward intolerance.
Yet entwined with that nostalgia was the psychedelic impetus toward fusion and freedom.
Imagine each vivid slash of color as a character, with his or her own impetus toward loss and stubborn striving.
The impetus toward universalism can be discerned even in those critics who are most skeptical of it, the so-called historical relativists who attempt to reconstruct each epoch's outlook and to understand works as they appeared to their first readers.
The other big fight for renewables this year will be on a Renewable Electricity Standard (RES), which would create the legal impetus to move toward clean energy.
The political impetus in Washington is toward tax cuts and spending.
Mr. Holt's bill would also substantially toughen the requirements for the touch-screen machines that have printers, and experts say this could give even more impetus to the shift toward the optical scanning systems.
The panel, in issuing its most definitive assessment yet of the risks of human-caused warming, hoped to give impetus to international negotiations toward a new climate treaty, which have languished in recent years in a swamp of technical and political disputes.
There were exceptions, such as True Story (founded 1919), which concentrated on entertainment, and Vogue, which introduced readers to a wider world, but more typical was Better Homes and Gardens (founded 1922), which gave fresh impetus to the trend toward "service" by helping both men and women in the running of their homes.
