**Explanation:**

The semiofficial body set up for controlling and standardization of roads and bridges in India is the Indian Road Congress (IRC). The IRC is the premier technical body of highway engineers in the country and is responsible for the development and maintenance of the road infrastructure in India.

**Role and Functions of Indian Road Congress (IRC):**

1. **Standardization of Guidelines:** IRC formulates and standardizes the guidelines for the design, construction, and maintenance of roads, bridges, and other transportation infrastructure in India. These guidelines cover various aspects such as geometric design, pavement design, traffic engineering, and road safety.

2. **Publication of Codes and Manuals:** IRC publishes codes and manuals that serve as reference documents for highway engineers and professionals. These codes and manuals provide detailed specifications and guidelines for different aspects of road and bridge construction, helping ensure uniformity and quality in the infrastructure projects.

3. **Research and Development:** IRC conducts research and development activities to promote innovation and improvement in the field of highway engineering. It collaborates with various research institutions, universities, and industry experts to undertake research projects related to road and bridge engineering, materials, and technologies.

4. **Capacity Building:** IRC organizes training programs, workshops, and seminars to enhance the technical knowledge and skills of highway engineers and professionals. These capacity-building initiatives help disseminate the latest advancements and best practices in the field of road and bridge engineering.

5. **Policy Advocacy:** IRC works closely with the government and other stakeholders to provide technical inputs and recommendations for policy formulation related to road and bridge infrastructure. It plays a crucial role in ensuring that the road network in India is developed and maintained as per international standards and practices.

6. **Networking and Collaboration:** IRC facilitates networking and collaboration among highway engineers, professionals, and organizations involved in the road and bridge sector. It provides a platform for sharing knowledge, experiences, and best practices through conferences, symposiums, and technical meetings.

In conclusion, the Indian Road Congress (IRC) is the semiofficial body responsible for controlling and standardizing roads and bridges in India. It plays a vital role in developing and maintaining the road infrastructure by formulating guidelines, publishing codes and manuals, conducting research, capacity building, policy advocacy, and facilitating networking and collaboration in the field of highway engineering.