Your Dad is Sooooo grounded!
Lowell Snohomish River Road between Everett, WA and Snohomish is an absolutely gorgeous stretch of country road where one can, in places, enjoy driving at higher than posted speeds without endangering the public. No cross roads, no drive ways. Snohomish River on your right. BNSF tracks parallell close on your left. http://maps.google.com/maps?hl=en&sugexp=frgbld&gs_nf=1&tok=ASZWlOMpd46ad JaPIY4tpw&cp=4&gs_id=d&xhr=t&bav=on.2,or.r_gc.r_pw .r_cp.r_qf.,cf.osb&biw=1920&bih=962&wrapid=tljp133 265709357206&q=lowell+larimer+road&um=1&ie=UTF-8&hq=&hnear=0x549000a2bdf83a49:0x210727ac058671c4, Larimer+Rd,+Everett,+WA&gl=us&ei=ybtuT-jYNOaOiALHxuSvAw&sa=X&oi=geocode_result&ct=image&r esnum=1&sqi=2&ved=0CC4Q8gEwAA
The point is, irrespective of the technicalities of the law, there are places where you can touch 120 and it's not terribly reckless to do so. Conversely, there are places where 30 is entirely irresponsible.