The phrase "alerted the driver" is correct and usable in written English.
You can use it when describing a situation where someone or something has notified or warned a driver about a specific event or condition.
Example: "The pedestrian signaled to the approaching vehicle and alerted the driver to stop."
Alternatives: "notified the driver" or "warned the driver."
The dispatcher alerted the driver: "D301, be careful!
A Transport for London (TfL) spokesman said passengers on the platform alerted the driver, who managed to brake after the first carriage passed over the family.
Other baubles included a backlit "Starfire" script that glowed when the headlights were turned on, a Wonderbar radio with a foot-operated tuning control and a Safety Sentinel that alerted the driver when a pre-set speed was exceeded.
They alerted the driver who made an emergency call, armed police swooped, closing the motorway and causing a tailback that stretched for miles on one of Britain's busiest roads.
This looks like it could've been a prime candidate for a pileup, including the Model X that captured the video, but instead as the dashcam footage shows, the vehicle not only alerted the driver about the potential collision but even started applying its emergency braking system before he himself could react and do so.
The backpack containing the bomb that Damon left behind was spotted by passengers, who alerted the driver at Canary Wharf.
Visual and audible warnings alert the driver.
Lane-departure warning systems can alert the driver if the vehicle crosses over lane markings.
Next, a chime alerts the driver that a text message — maybe important — has landed.
The real-time mitigation system used visual and auditory warnings to alert the driver to distracting behavior.
Today's automobiles include numerous computer chips that analyze sensor data and alert the driver to actual and potential malfunctions.
