In some of our earlier versions of TransitQuote Pro we included a pop-up version of the plugin.
This feature is no longer supported due to the fact that it was very rarely used and is less effective than the on-page form.
Pop-ups are more susceptible to conflicts with other on-page scripts, are harder to use on mobile and are more likely to be blocked by privacy tools.
For the reasons above we recommend avoiding pop-ups to increase the chances of customer bookings.