from the hands-on-for-hands-free dept.
Carl Bialik writes "The Wall Street Journal is reporting that States are scrambling to impose tougher restrictions on cell phone use by drivers, addressing what safety experts say can be a deadly distraction. From the article: 'Twenty-six states and the District of Columbia have written legislation on the issue, mostly since 2003, [...] This year, other legislatures are tackling the subject, and two states have passed laws on it. [...] While no state has banned talking on a cell phone while driving, Connecticut, New Jersey, New York and Washington, D.C., have the most restrictive laws: Except in emergencies, motorists in those states can use cell phones only with hands-free devices, such as earpieces. Restrictions vary across other states. Some prohibit teenagers, bus drivers and drivers with learning permits from using cell phones -- even with earpieces.'"
We warn the reader in advance that the proof presented here depends on a
clever but highly unmotivated trick.
-- Howard Anton, "Elementary Linear Algebra"