To effectively promote a business on a "No Parking" board, the key information that should be included is:

1. Business Name: Clearly display the name of your business to create brand recognition and make it easily identifiable.

2. Logo: Include your business logo for visual recognition and to reinforce brand identity.

3. Contact Information: Provide relevant contact details such as phone number, email address, or website URL so that potential customers can easily reach out or find more information about your business.

4. Business Location: Mention the address of your business to help people locate it easily or provide directions if needed.

5. Business Hours: Display your operating hours so that customers know when they can visit or contact you.

6. Promotional Message: Include a short and catchy tagline or promotional message to attract attention and generate interest in your business.

7. Clear "No Parking" Warning: Ensure that the "No Parking" message is prominent and easily visible. Use bold and large fonts, along with a recognizable symbol or icon to clearly convey the restriction.

8. Relevant Graphics: Incorporate eye-catching graphics or images related to your business to make the board visually appealing and engaging.

9. Brand Colors: Use colors that are consistent with your business's branding to maintain a cohesive visual identity.

10. Additional Information: Depending on your business, you may consider including additional relevant information such as special offers, services provided, or unique selling points to differentiate yourself from competitors.

Remember to keep the design clean, legible, and visually appealing. Use concise and clear language to convey the necessary information effectively.