84. H's transportation management department said that compared with last year, the road traffic in the city's urban area has improved significantly this year. The person in charge of this department believes that this is due to the city's employment of a large number of transportation assistants. Which of the following will not weaken the conclusion of the person in charge? ['Earlier this year, a special meeting was held in H city to carefully study and sort out traffic problems.', 'Many experts believe that hiring a large number of transport coordinators is costly.', 'At the beginning of this year, the new construction and expansion of the roads in the urban area of H City has just ended.', 'This year, city H has imposed strict restrictions on vehicles entering the urban area. Many large trucks and foreign vehicles cannot enter the urban area during the "peak" period of traffic.']