Modern fire engines in real life frequently have flat front windscreens. However, this is not a LEGO piece that has existed in six-wide from until the recent release of 7641 City Corner. Steven Asbury (s-asbury) immediately takes advantage of this new piece to create a Mack Collapse Rescue Unit.
Steven’s immediately previous LEGO fire vehicle is this big yellow airport rescue rig.
I’ve always liked Steven Asbury’s work. I’m surprised he hasn’t been blogged here more often! Some of the best looking/scaled Rescue vehicles I have ever seen. You can see more of his work (in addition to the 20 or so posts that are on MOC pages) here: http://www.brickshelf.com/cgi-bin/gallery.cgi?f=15136