The actual section of the Motor Vehicle Act is linked on BC4x4.COM.
The long and the short of it is this:
Vehicles that are manufactured with doors are REQUIRED to have said doors attached and on the vehicle. Period. The fact that the doors are made to be easily removed is irrelevant.
The only vehicles that can legally run doorless are those which were manufactured and sold with doors as an option. Note that this does not mean vehicles that have several different door styles available from the manufacturer (ie. YJ and TJ had full and half-door options). The spirit (and the wording and interpretation) of this section of the act is that the vehicle must have been available from the manufacturer with NO DOORS in standard trim. As noted above, the last vehicle which meets the criteria and can therefore LEGALLY drive doorless is the CJ.
That having been said, MOST police will not pull you over for running doorless providing you 1) have at least a driver's side side-view mirror attached and 2) are not driving around like a testosterone fuelled idiot with something to prove.
I used to own a YJ drove doorless for the better part of 11 summers and never got pulled over or ticketed for it. Then again, I didn't call attention to myself when I did.
'99 XJ Sport 4-dr
4.0 HO - AW4 - NP231 - D30, 4.10, Open - ChrysCo 8.25 29-Spline, 4.10, OEM Trac-Loc
5.5" home brew lift (BB + JKS ACOS/bastard packs + 1.5" Boomerang Shackles) | RE DBs + Adjustable UCAs & LCAs | JKS BPEs & Quicker Discos | Kevin's Offroad Trackbar | 33x10.50-15 BFG ATs | 15x7 Type 058 Eagle Alloys | RuffStuff Specialties HD Diff Covers | AA SYE | Modified Tom Woods driveshaft | LeBaron hood vents | Redline Hood Lift | B&M Tranny cooler | Reese Class III Receiver | 62mm bored TB | Borla Cat-Back Exhaust | C4x4 Fab Rear bumper & tire carrier | ORO Licence Plate relocation Kit | Kelley's WIP HD wiring upgrade | ZJ rear disc brakes | Stainless Brake lines | ARB front Bullbar | Orvis Edition Rear Spoiler
TO BE INSTALLED:
JKS Mini Skids | Rock Lizard Corner Guards | AEV/Nth Degree Oil Pan Skid | TnT Customs Unibody Stiffeners, HD Belly Pan & U-Bolt Eliminators
ARB Roof Rack | Warn 9000lbs Winch | Warn Manual Hub Upgrade | Rock lights | 231 Wide Chain Kit, 2Lo, 4:1 | Brown Dog Motor Mounts | Snorkel | Dual Batteries | OBA