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<p>The impact of delays during construction of the M4 junction 3 to 12 smart motorway
scheme was assessed as part of the economic appraisal undertaken prior to the start
of construction. This took into account various factors including the impact of the
construction programme in full, lane availability and also the effect of limiting
traffic speed to 50mph. This assessment gave an estimated value of £123m for user
delay costs during construction. The economic appraisal also forecasts that the scheme
could deliver £2 of benefits for every £1 of cost.</p>
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