Construction Merge

ST. PAUL, Minn. — Fifteen percent of drivers admitted to straddling lanes in order to block late merges in construction zones, according to a recent study conducted by the Minnesota Department of Transportation.

To address the more than 2,700 crashes and 18 fatalities occurring in highway construction zones last year, Mn/DOT commissioned a study to better understand the behaviors and attitudes that trigger driving decisions in merging situations as drivers enter a work zone.

"Our goal is to increase safety in work zones by reducing the confusion and frustration drivers often experience when merging," said William Servatius, Mn/DOT's Office of Construction. "Many times crashes occur due to aggressive driving, abrupt lane changes or sudden stops, so we want to help drivers make good choices while traveling through our work zones."

In an attempt to minimize the problems discovered in the research, Mn/DOT also conducted a month-long field study on Highway 10 in Anoka to assess a new Dynamic Late Merge System, a traffic control strategy to improve merging at lane closures.

"The fully automated system using remote traffic microwave sensors and a Doppler radar provides instructions to drivers via changeable message signs on when to merge and how to merge according to the current state of traffic," said Craig Mittelstadt, Mn/DOT's workzone safety specialist. "For example, if traffic is heavy, the system will instruct motorists to use both lanes and take turns once they've reached the defined merge point just before the lane closure."

This strategy often referred to as the "zipper" improves traffic flow, reduces conflicts and hopefully will decrease the number of crashes when traffic demand exceeds the capacity of a single lane closure.

"Basically, we want drivers to know that under normal traffic speeds, they should try to merge early to avoid unsafe merging maneuvers; however, when traffic is congested, drivers should use both lanes all the way to the definite merge point," said Servatius.

"We can't completely rid the roads from congestion in a workzone, but data from the study revealed this method shortened queue lengths by 35 percent and reduced lane changing conflicts," said Mittelstadt. "We also hope for a decline in crashes and aggressive driving behavior."

Forget the on-ramp for a minute.  Let's have four lanes on the freeway.  Signs say lane #1 is closing down the way.  Why not keep that lane full and zipper lanes #1 and #2 at the spot where they actually merge?  I don't get the arbitrary rule which says a driver in lane #1 has to say "oh, my lane is ending about ${5000/2000/1000/500/50} yards ahead so I need to merge right now."  We don't hold drivers to the same standard if lane #1 is actually going away and the freeway narrowing to three lanes permanently.  It's only for construction merges that we (y'all) have this rule. 

I hold doors, help old people, refrain from kicking cats even though they need kicking, put my shopping cart away, change to the inside lane so the guy turning right can get out of the side street, never walk on stroh in life, etc.  I just don't see this one as "jackasses who invariably pretend they either don't, or they are too important to merge early."  I see it as a common sense approach and I wish everyone would do it / allow it to be done.

Put me down for about 2.5.  Go down that good lane, but definitely merge before the paint squeezes the lane away.  And with my usual benevolent love for self testicular exams and all God's creatures.  Even the stupid ones.