Traffic control boards are predominantly seen in areas with changing road layouts. You'll encounter them frequently on motorways and major arterial roads where lanes might merge, shift, or reduce due to construction, accidents, or special events. They are designed to prepare drivers well in advance of the actual change, allowing for smoother and safer adjustments. For instance, a lane transfer board might indicate that your current lane will close ahead, requiring you to move to an adjacent lane. Similarly, lane narrowing boards signal that the number of available lanes will decrease, necessitating a merge. Lane separation boards clearly delineate where lanes diverge, often showing which lanes continue straight and which will exit or divert. Understanding the specific configuration shown on these boards, whether it's a simple lane reduction or a complex diversion involving oncoming traffic, is critical for maintaining situational awareness and avoiding sudden, dangerous manoeuvres.