The characteristics of modular lightweight composite truss-type transportable bridge for disaster relief are:
(1) Modularization: the modular structure of single truss and double truss structure makes the bridge suitable for a span of 10-50 meters.
(2) Lightweight: the use of lightweight composite to reduce the weight of bridge and overcome the problem that bridges need heavy machinery to erect and assemble.
(3) Easy assembly: the use of bolts to join composite truss panels and use of pins to connect modular segments, the assembly method is simple, easy and save erection time.
(4) Re-usability: the use of bolts and pins to join composite truss panels and module segments, which is convenient for assembly and disassembly, it can be recycled and reused.
The technical specifications of the rescue bridge are：
(1) bridge span: 10-50 m,
(2) net width of bridge: 3 m,
(3) load capacity: 5 t live load,
(4) assembly time: within 8 hours (30 worker, 1 small crane and simple tools).

The technical characteristics of modular lightweight composite truss-type transportable bridges for disaster relief are:
(1) development of lightweight truss-type modular segments to improve applicability of disaster-relief portable bridges (applicable bridge spans of 10-50 meters),
(2) application of incremental launching methods and the self-weight balance principle, improve the high safety of erection, 
(3) the use of bolts and pins connection for easy assembly composite truss panels and module segments (assembly time within 8 hours) and reusable.

Natural disasters such as typhoons, flooding, and earthquakes pose a severe threat which cut off numerous mountain communities from the outside world and prevented emergency disaster relief supplies and personnel from reaching these areas. The proposed rescue bridge can enable quick emergency access and transport of foodstuffs to stricken areas, and minimize loss of life and property losses by allowing rescue personnel to take advantage of the golden period for relief work.
It is suitable for industries with disaster prevention and emergency restore traffic requirements, such as the National Fire Agency of the Ministry of the Interior and its affiliated units, the bridge management units under the central and local governments, and the county and municipal government fire departments.