Foreign meddling makes it all the more difficult to end the war.
The researchers chalked this up not just to darker roadways, but also to drivers having a difficult time adjusting to the end of daylight-saving time.
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In New Zealand, third seed Yanina Wickmayer shrugged off her difficult end to 2009 by winning the ASB Classic in Auckland on Saturday.
However, Robin Newton, of the Democratic Unionist Party, said a lack of engagement from protest organisers was making it difficult to see an end to the unrest.
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The election, and subsequent posturing from the political parties, is making it difficult to navigate year- end tax planning.
And what is more, scores of African soldiers seem to be paying the ultimate price to contain this growing threat and it is difficult to gauge how long it will take to end it all.
Dr Kenneth Goodman, an ethics professor at the University of Miami, says that much of the legislation aimed at making it difficult to withdraw care in end-of-life cases had failed to make it onto the statute books.
Reverend Dr Donald MacDonald from the Free Chruch of Scotland told MSPs the proposals would make it difficult to oppose anyone wishing to end their life.
If you gain fat easily, stay on the lower end of the range, and if you find it very difficult to gain weight in general, aim for the higher end of the range.
It was a happy end to a difficult week for Glentoran whose debts have led to worries they might have to go into administration.
It sealed a remarkable end to a difficult season in which Portuguese manager Andre Villas-Boas was sacked in March, just nine months after he arrived from Porto.
Dr Vivienne Nathanson, head of science and ethics at the British Medical Association, said the advice provides "a good steer" for doctors on how to approach the difficult area of end of life care.
The European Parliament said that corruption, weak judicial systems and discrimination against minorities in the 12 countries seeking to join the European Union could make it difficult to pass accession legislation by the end of 2002 deadline.
While this is a difficult decision, we have moved quickly to end any further uncertainty.
Laura: We learned that it was really difficult to gain customer trust for high-end jewelry rental online.
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For instance, the issue whether additional stimulus spending that is presented as temporary may end up being politically difficult to prevent from becoming permanent.
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"Every international game is very difficult, and Iceland battled right to the end, " continued Burley, whose record as manager stands at two wins from nine games.
It would be difficult to dispute that Brown, by the end of the match, had earned the bragging rights, principally as a result of having curled in a fine equaliser to earn his side a replay.
Republicans and Democrats agreed then to postpone difficult decisions on spending until the end of 2012.
While not the most sympathetic character in the show, it was especially difficult to know that her death came at the end of a long spell of silence between her and both her husband and son.
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But, after the entrance examination, it became clear that this was not achievable, so the difficult decision was taken to close the school at the end of the 2013 summer term.
Mr. IAN: These things have to be difficult and it takes you a long time to be able to get all the way through in the end.
At the end of the day, it is difficult to see where either side has put forth a definitive answer on this topic.
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She said it would be difficult for people to travel to the new centre in Hough End, Chorlton, which is about 1.5 miles (2.4km) away.
"Our television business continued to perform well at the top end of a difficult broadcast market, " he said.
The government has faced a difficult few weeks since the Budget, with criticism of plans to end age-related tax allowances for pensioners and to impose VAT on pasties, as well as the charity move.
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