What must the driver of a non-rail vehicle be guided by first and foremost to determine the number of lanes on the carriageway?

• 1By lines of horizontal and vertical road markings.
• 2Only by the lines of horizontal road markings.
• 3Only by the road signs "Direction of Travel by Lanes" and "Direction of Travel in a Lane".
• 4Answers 1, 2, and 3.
• 5By road markings or the road signs "Direction of Travel by Lanes" and "Direction of Travel in the Lane.