Key for turning on a road vehicle and relative road vehicle

Road vehicle (1) comprising:

• four wheels (2), of which at least one pair of wheels (2) is driven;
• a passenger compartment (3);
• a powertrain system (5);
• an ignition system (6) for the powertrain system (5) comprising in turn a slot (8) integral with the passenger compartment (3) of the road vehicle (1) and configured to receive and accommodate a key (7) for the ignition of the road vehicle (1);
• the road vehicle (1) being characterised in that the ignition system (6) comprises a detection system (10), configured to detect the presence or absence of the key (7) at the slot (8), and a control unit (11), which is connected to the detection system (10) and to the powertrain system (5) and is configured to enable the power supply to the powertrain system (5) only when the key (7) is detected at the slot (8);
• the vehicle (1) comprising a luminous element (16) inside the passenger compartment (3), which is configured to assume a first colour when the key (7) is not detected inside the slot (8) and a second colour when the key (7) is detected inside the slot (8), the first colour and the second colour being different to each other.