Afghan traffic instruction lists the factors a driver must weigh when choosing a safe speed on approach to a junction. Which set reflects those factors?

1. The driver's alertness and physical state, the condition of the road, the wind, the bend, the field of view, the weather, and the load being carried
2. The engine capacity, the fuel level, the age of the vehicle, and the colour of the bodywork
3. The time of day, the driver's years of experience, and the number of passengers only
4. The posted limit alone, since conditions do not change what speed is lawful