Here are a few options for a WordPress post tag description, focusing on different aspects and tones, all in Traditional Chinese:

**Option 1 (Concise and Informative):**

> 關於帶著貓咪搭乘各種交通工具（包括公共交通、計程車等）時的規定、注意事項和建議。

* **Translation:** Regulations, precautions, and suggestions for taking cats on various modes of transportation (including public transport, taxis, etc.).
* **Focus:** Directly addresses the content of the tag.

**Option 2 (Engaging and User-Oriented):**

> 想帶貓咪一起搭車嗎？了解貓咪搭車的相關規定和技巧，讓你的貓咪旅程更安全、舒適！

* **Translation:** Want to take your cat on a ride? Learn about the regulations and tips for cat travel, making your cat’s journey safer and more comfortable!
* **Focus:** Appeals to the audience and emphasizes benefits.

**Option 3 (Detailed and Comprehensive):**

> 貓咪搭車指南，涵蓋了從捷運、公車到計程車等不同交通工具的規定、安全措施、寵物籠選擇、以及如何讓貓咪在車上保持鎮定的方法。 適合所有希望帶著愛貓出行的主人們。

* **Translation:** Your guide to taking cats on transportation, covering regulations on different modes of transport, from the MRT and bus to taxis, safety measures, pet carrier choices, and how to keep your cat calm in the car. Suitable for all owners who want to travel with their beloved cats.
* **Focus:** Provides a more complete overview of the tag’s content.

**Option 4 (Practical and Specific):**

> 貓咪搭車規範： 查詢各交通工具的寵物搭乘規定，準備好貓咪的旅行包，避免罰款，安心帶貓咪出行。

* **Translation:** Cat Transportation Regulations: Check the pet-travel regulations for each mode of transportation, prepare your cat’s travel bag, avoid fines, and travel safely with your cat.
* **Focus:** Offers a very practical and specific outline of what the tag covers.

**Choosing the Right Option:**

Consider these factors when selecting the best description:

* **Your target audience:** Who are you trying to reach?
* **The overall tone of your blog:** Is it formal, friendly, or informative?
* **The content of the posts associated with this tag:** What specific topics will be covered?
* **Word count limits:** WordPress may have character limits for tag descriptions.

You can also modify any of these to better suit your needs. For instance, you can combine elements from different options. Good luck!