Street widening, alignment, corrections, channelization of intersections, construction of barriers, new or improved traffic signalization, signs, curbs, sidewalks, trees, 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 equal to the ratio of the estimated peak-hour traffic generated by the proposed property or properties to the maximum traffic capacity of the road or intersection, as determined by accepted engineering standards (i.e., say 40 cars are projected from new development, and the road capacity is 1,000 cars, the proportionate share would be equal to 4% of the improvement). The ratio thus calculated shall be increased by 10% for contingencies.