'critical driver' is correct and can be used in written English.
You can use 'critical driver' to refer to something that is essential or necessary for progress or success. For example, "Timely communication is a critical driver in the success of any project."
In those areas, a critical driver will sense some rough spots.
Garment exports are a critical driver of the Bangladeshi economy, which creates pressure to keep wages low and workers in line.
Consumer spending, a critical driver of growth that typically helps lead recoveries, continues to be tepid, dimming hopes for a fast-paced recovery.
It is a critical driver of economic growth and with that comes higher living standards for the population, including even for the workers displaced by technological advancement who, in a strong economy, will find alternative employment.
"The mobile Internet is a dynamic industry that can be a critical driver in restoring American economic growth and job creation, but only if companies are allowed to react quickly to customer needs and market forces," he said.
Economists at UBS said in a recent report that they expected the weakening yen to remain "a critical driver" of increased profits for Japanese companies in the current fiscal year.
For years, China has promoted the auto business, viewing it as a critical driver of economic growth and industrialization, and all kinds of companies -- from motorcycle manufacturers to cellphone-battery makers -- have started assembling cars.
Housing is a critical driver for the economy, not just because of the jobs and supplies needed to build homes but also the appliances and furnishings that new occupants buy.
Modern telecommunications technology is now widely seen as a critical driver in economic development.
Thus, the kink is a critical driver of the observed structural diversity in CDR H3.
The ability of carriers to fill their vehicles to capacity is a critical driver of their productivity.
