| I. Motorcycle engineering changes |
 |
A. |
Frame design and construction |
| B. |
New types of motorcycle (e.g., sportbikes) sold
as original equipment |
| C. |
Suspension design |
 |
1. |
Front fork strength, stiffness, and geometry |
| 2. |
Rear suspension change from two to one shock systems |
| D. |
Fuel tank design |
| E. |
Handlebar design and construction |
| F. |
Engine performance increases |
| G. |
Tire and wheel improvements |
| H. |
Brake efficiency improvements |
 |
1. |
Disc brakes more common |
| 2. |
Interconnection of front and rear brake systems |
| 3. |
Antilock braking system (ABS) |
| 4. |
Hydraulic brakes |
| 5. |
Linked brakes |
| I. |
Emissions systems introduced |
| J. |
Lighting changes |
 |
1. |
Daytime running lamps (DRL) since 1973 |
| 2. |
Integrated front parking lights |
| 3. |
Higher performance headlamps |
| II. User population changes |
 |
A. |
Fewer total riders, higher percentage licensed |
| B. |
Maturing of motorcycle riding population |
| C. |
More females riding motorcycles |
| D. |
More widely available training |
| E. |
Changes in helmet use |
| F. |
Use of fake helmets in helmet law states |
| G. |
Fewer motorcycles registered |
| H. |
Changes in available protective apparel |
| I. |
Changes in use of protective apparel |
| J. |
Riders have information from Hurt Report available |
| III. Automobile engineering changes |
 |
A. |
Daytime running lamps (DRL) |
| B. |
Improved bumpers |
| C. |
More aerodynamic exteriors |
| D. |
ABS |
| E. |
Changing vehicle types, e.g., sport utility
vehicles (SUV) |
| IV. Roadway Environmental changes |
 |
A. |
Roadside sound barriers |
| B. |
Animal diversion barriers |
| C. |
Rumble strips |