You should consider the following factors;
1. State of the driver
Driver should be sane, reasonably fit and capable to handle the vehicle.
2. Condition of Car
Brakes, lights, steering, tires, wiper blades and all essential components should be in good conditions. Tire pressures, fluid levels and fuel levels need to be checked and has to be in satisfactory condition.
3. Environmental factors
Both car and driver should be capable of handling weather conditions. They can involve rain, snow, sleet, hail, fog, ice and anything that affects visibility. Should situations deteriorate, be prepared to stop or make changes in travel plans
Be prepared to adjust speed to terrain, precipitation, pedestrian density, and other hazards.
4. Passengers and Payload
Make sure the car is not overloaded. Adult and children should be well secured. Seat belts or proper child restraints should be used as needed.