What colour road sign indicates you are on a main route?

The use of green road signs is specifically designed to indicate that you are on a main route. This is primarily because green signs are typically employed for directional information on major roads and motorways, guiding drivers to significant destinations or junctions. They serve as a clear indicator for main routes, helping to enhance navigation and assist road users in identifying key thoroughfares.

In contrast, blue signs are often employed for informational purposes, particularly for services, while white signs are typically used for local routes and minor roads. Yellow signs usually denote warning or caution signs, alerting drivers to potential hazards ahead. The distinctive color coding within road signage helps drivers quickly and efficiently interpret the information necessary for safe and effective navigation.