Last night I was driving from Harrisburg to Lewisburg，Pa．，a distance of about eighty miles．It was late．I was late and if anyone asked me how fast I was driving，I'd have to plead1) the Fifth Amendment2) to avoid self－incrimination3)．Several times I got stuck behind a slow－moving truck on a narrow road with a solid white line on my left，and I was clinching my fists with impatience．
