Final answer:
Before leaving on vacation, you encountered a flat tire that needed to be fixed.
Step-by-step explanation:
Before you could leave on your vacation, you had to fix a flat tire. This incident occurred prior to your departure and it was an unforeseen obstacle you had to overcome. Ensuring your vehicle was in good condition was essential for the journey, much like other preparations that might be necessary such as ensuring you have enough fuel, your passports for international travel, or finalizing your decision to undertake the trip. This unforeseen issue caused a delay in their departure. While we were all ready and prepared to go, the flat tire caused a delay in our plans.