The second part is the examination process- the driver has to undergo a lot of medical tests and exams. This examination takes around 35 to 45 minutes where the General Physician observes the drivers responses, vital signs and accordingly fills out the D4 form. Tests under HGV Medical Exam The GP checks for vital signs of the driver. The signs have to be better than an average driver as the HGV driver has to be more careful while driving since they will be driving a bigger vehicle having more people or goods fitted into it. Vision Assessment This is carried out by an optician or optometrist; however it can also be checked by a General Physician.