Investing in car signwriting can be a cost-effective way to promote a business or brand. The vehicle can act as a mobile billboard, reaching a wide audience and increasing brand awareness. Additionally, car signwriting can also be used for fleet branding and to make vehicles easily identifiable to customers. It can also be a cost-effective way to advertise as compared to other forms of advertising like TV, radio, and print. It can be considered a cost-effective way to reach a target audience.