About 800 vehicle accidents that occurred at the top 10 most dangerous
intersections in the Phoenix area tell a story beyond driver error. Such
crashes offer guidance to city traffic experts, helping them design and build
safer streets.
The crash numbers come from an Arizona Republic analysis of 2010
police reports compiled by the Arizona Department of Transportation. The
accidents on city streets include only those collisions that left someone
injured or with at least $1,000 in damage to vehicles. All but one of the
top 10 intersections fall in two cities: Glendale and Phoenix.
Traffic engineers say road infrastructure, surrounding land
use, traffic volume and driver error play a big part in why those intersections
top others across Maricopa County. History also plays a role. The Valley
has seen a shift in road planning over several decades — moving away from wider
arterial streets and embracing freeways. Still, the Phoenix metro area is left
with arterial streets as wide as eight lanes that attract commuters and are
ripe for accidents.
Glendale, Peoria and other cities in the Valley use crash data
— from ADOT, the Maricopa Association of Governments and local police
departments — to plan road improvements targeted at limiting collisions.
Sometimes, it is costly upgrades, such as adding loading points for buses
and additional lanes for vehicles, which experts say is sometimes necessary to
create more capacity. Other times, it can be as inexpensive as changing the
timing of a traffic light or putting up a warning sign. Police presence and
campaigns to make drivers more aware of hazards are vital in reducing those
numbers, engineers say.
Despite those efforts, there will always be crashes when
thousands of drivers are making split-second decisions, Phoenix traffic
engineer Kerry Wilcoxon said. “It always comes down to individual driver
decisions and making good decisions — keeping an eye on the road, keeping
attention focused,” he said.
Top-crash intersection
Glendale’s 59th and Olive avenues has the unfortunate title of intersection
with the most crashes, with 99 crashes in 2010 — an average of nearly two per
week. The suggestion is that drivers zip from bustling Glendale Community
College, apartment buildings and retail shops.
Glendale principal traffic engineer Chris Lemka said more than
half of the crashes there are rear-end collisions, a sign the road may lack
capacity to accommodate the traffic that floods the intersection during morning
and evening rushes. The cash-strapped city is going after federal dollars
for improvements, such as raised medians to limit access to driveways that are
too close to the intersection and adding another lane to accommodate rush-hour
traffic. The opening of Northern Parkway should draw some traffic off Olive,
although the limited access parkway won’t be fully completed for years to come.
Lily Loaisiga, a 20-year-old student, said she has seen a crash
just about every week in the years she has attended GCC. “It happens so
often,” she said. “We’ve gotten used to it.” Student Anthony Sanchez, 51,
said drivers seem preoccupied and in a rush most of the time. He felt the
results two weeks ago as his car was rear-ended after class.
How volume factors in
There’s a direct correlation between crashes and traffic volume.
Dunlap and 35th avenues in Phoenix, the second-highest crash spot in the
Valley with 98 crashes in 2010, is one of the busiest intersections in Maricopa
County, Wilcoxon said. Nearly 70,500 vehicles traveled through the area
each weekday in 2010, according to MAG data, which ranks about 91percent higher
than the other 366 intersections engineers monitored. The intersection is
near high-density apartments, Cortez High School and a park. Metrocenter mall
is about a mile away.
“You’ve got kind of a perfect storm of mixed uses,” Wilcoxon
said.
Thunderbird Road and 59th Avenue in Glendale, another high-volume
intersection, had the sixth-highest number of crashes in 2010. The intersection
is Glendale’s top spot for rear-end collisions, Lemka said, likely because of
congestion during peak travel hours. But volume alone does not dictate
the number of accidents.
On the Glendale-Peoria border, Loop101 and Bell Road was the
Valley’s busiest intersection in a 2010 MAG count with 94,268 vehicles
traveling through each weekday, but it is 24th on the Valley-wide crash list.
Jamsheed Mehta, who oversees transportation in Glendale, said the city
has tweaked signal timing on Bell Road so more cars can get through the light
cycle. The less a group of cars has to stop, the fewer rear-end accidents, he
said. ADOT widened the on-ramps last summer to improve traffic flow.
Enforcement
Engineering is key to making roads safer, but enforcement and driver
education can go a long way in altering behavior, said Sarath Joshua, ITS and
safety program manager for the Maricopa Association of Governments.
Joshua said most accidents come down to driver error, whether speeding or
failing to see the car in front making a turn. “That pretty much says the
whole story,” he said.
Tempe’s top crash intersection, according to ADOT figures, is
Southern Avenue and Rural Road with 73 accidents in 2010. Sgt. Steve
Carbajal, who leads Tempe’s vehicle-crimes unit, said Tempe police typically
pay more attention to top crash spots — including Southern Avenue and Rural
Road. The department deploys more police and campaigns to raise driver
awareness. “As everybody knows, when people see a police officer, more
than likely they’re not going to commit traffic violations,” he said.
Wide roads a challenge
Indian School Road and 67th Avenue, fourth on the Valley-wide crash list, is
“extremely wide,” said Tom Godbee, Phoenix’s deputy street-transportation
director. Indian School Road is the widest arterial road in Phoenix, with
eight lanes between Interstate17 and Seventh Avenue. At 67th Avenue, Indian
School Road is seven lanes wide. The intersection had 80 crashes in 2010.
More lanes mean more opportunities for drivers to collide,
Joshua said. Wide roads can encourage drivers to speed when there are fewer
vehicles on the road. Godbee said the multi-laned arterial roads were
planners’ efforts to accommodate growth decades ago when freeways were largely
opposed. Additional lanes are added in some cases when a road lacks capacity to
accommodate rush-hour traffic.
“To get around the Valley, you pretty much had to rely on the
major street arterial network,” he said. “We’re always struggling with that —
trying to do what we can to counter some of the philosophy from the 1970s and
’80s.” At the forefront of a years-long opposition were Eugene Pulliam,
longtime owner and publisher of TheRepublic and the Phoenix Gazette,
and his wife, Nina, who spoke out against freeway plans primarily through the
papers’ editorial sections.
Voters backed the resistance, shooting down plans to develop
Interstate10 in the metro area in 1970. A public shift came in the mid-1980s
when voters approved a half-cent sales tax to fund a 20-year freeway
construction program. Joshua said that history plays a role in Arizona’s
crash numbers as about 60 percent of Valley drivers use arterial streets rather
than freeways, in part because freeways are a relatively recent development and
don’t always get drivers close to their destinations. The Valley would see
fewer crashes if drivers used more freeways, he said, because traveling on
streets means more stops and starts, as well as left and right turns, spurring
more chances for accidents to happen. Freeways are designed at higher
standards than other roadways and provide fewer opportunities for drivers to
interact, Joshua said.
Road improvements
Still, traffic engineers point to intersections where infrastructure changes
have reduced crash numbers. Camelback Road and 19th Avenue was
extensively modified in 2006 to accommodate the light rail. Construction
discouraged some traffic, but much of the change came through reconstruction of
business-access driveways and more stringent signal regulation, Wilcoxon said.
“It’s still a very busy intersection. It’s got a lot going on obviously,
but it hasn’t risen to the level it was at before,” in terms of accident
numbers, he said.
In the three years before light-rail installation, the area
averaged 66 crashes annually, Wilcoxon said. In 2010 and 2011, that number
dipped to an average of 29 crashes annually. More recent improvements in
Glendale should show up in crash numbers in coming years, Lemka said. The
city used federal funds to put in medians at Northern Avenue and Camelback Road
on 51st Avenue, where driveways too close to intersections were a factor in
rear-end crashes. “When we go back and look at it, we fully expect the
rear-end accidents to be down, the left-turn accidents at the driveways to be
down — in fact, (they will) be non-existent,” Lemka said.
Interestingly, these cities and the State
of Arizona RARELY if ever use their own funds for any street or highway
improvements. They request federal funds. If received, then
improvements may be made. If not, the improvements largely never occur.
In other words, if they can't get the federal government to pay for it,
it generally never gets done. As a Phoenix Car Accident Lawyer, I find this outrageous.
They can blame the federal government, and as
suggested in this article, they can blame "driver inattention and
error". Rarely do they accept responsibility for poor engineering,
design, planning or maintenance. The governmental entities, by way of
Arizona law, have a legal duty to provide safe roads. They are not
obligated to "guaranty" safety, as that is not possible. However,
they are required to continuously maintain observation and good engineering
judgment for possible problems and necessary modifications. As we have
witnessed too often, this duty is not always met.
By in-large, the governmental units do a good job of
designing and maintaining the Arizona roads. However, even when there is
a problem, they often cite "lack of funds" or "driver
error". Like a little kid, they try to blame someone else.
Sometimes they get away with it, but sometimes they
are held legally accountable. There is no better example at this point in
time than the horrendous failures of the State of Arizona to maintain safety on
Interstate 10 between Phoenix and Tucson. But that is a lengthy topic,
for another blog.