but the quesion was how to upload multiple files at the same time right?
what I usually do, is give each "file" field a different name "car1, car2, car3, etc..." and process each one manually.
<cfif #car1# NEQ "">
<cffile action="upload" filefield="car1" accept="image/*" destination="/your_images_dir" nameconflict="MakeUnique">
<cfset car1_filename = #File.ServerFile#>
</cfif>
<cfif #car2# NEQ "">
<cffile action="upload" filefield="car2" accept="image/*" destination="/your_images_dir" nameconflict="MakeUnique">
<cfset car2_filename = #File.ServerFile#>
</cfif>
do that for each one and you'll have all of your filenames, then input them into your database.