See also:

Speedometer
The speedometer shows the vehicle's speed in either kilometers per hour (km/h) or miles per hour (mph). ...

Following Distance
Stay at least twice as far behind the vehicle ahead as you would when driving the vehicle without a trailer. This can help to avoid situations that require heavy braking and sudden turns. ...

What to Add
When you do need brake fluid, use only DOT-3 brake fluid. Use new brake fluid from a sealed container only. Always clean the brake fluid reservoir cap and the area around the cap before removing i ...