These are some of the more important Texas state statutes for electric bicycles. If you find some I missed please post them in this thread.
Texas Transportation Code - Section 541.201. Vehicles
(24) "Electric bicycle" means a bicycle that:
(A) is designed to be propelled by an electric motor, exclusively or in combination with the application of human power;
(B) cannot attain a speed of more than 20 miles per hour without the application of human power; and
(C) does not exceed a weight of 100 pounds.
(10) "Motor-driven cycle" means a motorcycle equipped with a motor that has an engine piston displacement of 250 cubic centimeters or less. The term does not include an electric bicycle.
(11) "Motor vehicle" means a self-propelled vehicle or a vehicle that is propelled by electric power from overhead trolley wires. The term does not include an electric bicycle
Texas Transportation Code - Section 541.201. Vehicles
(24) "Electric bicycle" means a bicycle that:
(A) is designed to be propelled by an electric motor, exclusively or in combination with the application of human power;
(B) cannot attain a speed of more than 20 miles per hour without the application of human power; and
(C) does not exceed a weight of 100 pounds.
(10) "Motor-driven cycle" means a motorcycle equipped with a motor that has an engine piston displacement of 250 cubic centimeters or less. The term does not include an electric bicycle.
(11) "Motor vehicle" means a self-propelled vehicle or a vehicle that is propelled by electric power from overhead trolley wires. The term does not include an electric bicycle