bad-ui-design

Users shouldn’t be guessing which option is available or not when they are searching for something.Take this search as an example. National Car Rental website shows the user all the locations available to book a car for the dates already selected, but when you try to select one of them, two errors appears: either the store doesn’t open at the select date and time or the store is not valid for the promotion code added.As you can see, there are many stories in the São Paulo (City in Brazil) area that supposedly is “available” to book (the red error only shows after your try to book), but after 2 minutes of clicking on all of them, only 2 or 3 were actually accepting bookings at given filters.The only exception I’d like to mention is when the unavailable option is placed in the results as a m...