As it is 8 years old car so my suggestion is to check following things before going on highway.
Your radiator must be services along with complete checkup of water body and hose pipe etc, because it's hot weather these days and you will use AC obviously so cooling system must be perfect.
Secondly check excel and its boots.
Check ball joints
Check breaks and change pads if needed.
And have general checkup of your car like engine oil, break oil, coolant, battery level, etc