"problem to be faced" is a correct and usable phrase in written English.
It is an objective phrase that is used to describe any issue or difficulty that has yet to be addressed. For example, "The problem to be faced is that the economy is suffering."
But even greater improvement is possible when we all accept that sooner or later, mortality is not a medical problem to be solved but a spiritual problem to be faced.
In the case of the capacity analysis at intersections and roundabouts, the impact of uncertainty depends on the kind of problem to be faced and/or solved.
Nowadays, the main problem to be faced in the frames of a road management policy is the compliance of old roads, constructed in the 50's or 60's, to new construction standards and traffic needs, through a realistic and comprehensive approach.
Having long treated substance use as a matter for the police and prisons, many policymakers are finally coming to understand drug dependence as a disease and public health problem, to be faced with science and empathy.
And because we have lived through two decades in which debt was never regarded as a problem -- certainly never as a problem to be faced now -- the results are all too familiar: a mountain of liabilities.
The main problem to be faced up by these techniques is the well-known small sample size problem, that is, the number of available samples is much lower than the number of features used in the training step.
In such climates, overheating of indoor spaces and therefore excessive energy consumption are the main problems to be faced.
We see from the foregoing discussion that there are various problems to be faced by extant versions of logicism or neo-logicism in the literature.
Nowadays, the discharged effluent is one of the main problems to be faced in the future with increased disagreeable effects (Moazzam et al. 2012).
The problem persisted and was considered so important by Hilbert that he placed it first on his famous list of open problems to be faced by the 20th century.
There were three areas of disagreement: perspectives, aesthetic presuppositions, and relative significance of the various problems to be faced in seeking to win greater public acceptance of wind energy.
