This study aims at addressing schedule delay in road construction projects in Saudi Arabia. The evaluation of the progress reports of 55 road projects constructed during the period 2011-2015 in Saudi Arabia concluded that delays are extensive: the average ratio of planned contract duration to the actual completion time is 58.24%, ranging from 2% to 172%. The study also investigated the main factors and effects of schedule delay in road construction projects through a questionnaire survey. 70 contractors working in road construction completed a structured questionnaire survey. 34 identified factors were ranked according to their levels of severity, frequency, and importance. Results indicated that the top five important factors affecting schedule delay in road construction projects are: improper planning, poor labor productivity, additional works, rework, and lack of contractor experience. The study concluded that the main effects of schedule delay in road construction projects as assessed by contractors are: cost overrun, disputes, arbitration, litigation, and poor quality. Based on the study findings, the following recommendations were formulated: Managerial skills of construction parties should be improved, Labors' motivation system should be developed, More communication between construction parties should be done at the early project stages to minimize late changes during construction phase, Policy of contract awarding should be improved: resources and capabilities of bidders should be checked carefully.

This study is conducted to recognize the major delay factors, the major construction productivity factors, and to establish the relationship between productivity and delay in construction projects in Saudi Arabia. A questionnaire survey is performed to achieve study objectives. Fourteen-time overrun factors and 13 construction productivity factors are listed in a questionnaire form. Fifty contractors consultants are asked to rank the identified factors according to their importance. The study also addresses the relationship between labor productivity and time overrun based on data collected from 34 building projects implemented in Saudi Arabia. Results conclude that the top factors affecting delay in construction projects are: poor labor productivity, poor coordination between construction parties, lack of adequate manpower, bid award for lowest price, and mistakes in design. It also indicates that the major labor productivity factors are: payments delay, lack of labor experience, frequent change orders, rework, and financial conditions of the contractor are ranked overall as the top 13 factors affecting labor productivity on construction sites. Regression analysis for data collected from 34 building projects indicates a strong correlation between the delay and labor productivity. It is hoped that the results of this study will be helpful for construction parties and researchers in Palestine and other developed and developing countries.

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