For street improvements, including street widening,
alignment, corrections, channelization of intersections, construction
of barriers, new or improved traffic signalization, signs, curbs,
sidewalks, utility improvements not covered elsewhere and the construction
of new streets and other similar street or traffic improvements, the
applicant's proportionate share shall be in the ratio of the estimated
peak hour traffic generated by the proposed property or properties
to the sum of the present deficiency in peak hour traffic capacity
of the present facility and the estimated peak hour traffic generated
by the proposed development. The ratio thus calculated shall be increased
by 10% for contingencies.